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| Achnanthidium lanceolatum var. genuinum Mayer 1913 |
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| Achnanthidium lanceolatum var. inflata Mayer 1913 |
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| Achnanthidium lanceolatum var. minimum Mayer 1913 |
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| Amphora ovalis f. angusta Mayer 1913 |
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| Amphora ovalis f. globosa (Schumann) Mayer 1913 |
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| Amphora ovalis f. minutissima (W. Smith) Mayer 1913 |
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| Caloneis silicula f. angusta Mayer 1913 |
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| Caloneis silicula var. elliptica Mayer 1913 |
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| Caloneis silicula var. gibberula (Kützing) Mayer 1913 |
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| Caloneis silicula var. inflata (Grunow) Mayer 1913 |
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| Caloneis silicula var. intermedia Mayer 1913 |
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| Caloneis silicula subsp. limosa (Kützing) Mayer 1913 |
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| Caloneis silicula f. minima Mayer 1913 |
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| Caloneis silicula f. minor Mayer 1913 |
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| Caloneis silicula f. minor Mayer 1913 |
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| Caloneis silicula f. rhomboidalis Mayer 1913 |
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| Caloneis silicula subsp. ventricosa (Ehrenberg) Mayer 1913 |
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| Ceratoneis arcus var. genuina Mayer 1913 |
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| Cocconeis pediculus f. orbicularis Mayer 1913 |
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| Cocconeis placentula var. genuina Mayer 1913 |
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| Cocconeis placentula f. minutissima Mayer 1913 |
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| Cymatopleura solea f. lata Mayer 1913 |
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| Cymatopleura solea f. minuta Mayer 1913 |
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| Cymbella cistula var. eucistula Mayer 1913 |
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| Cymbella cistula f. recta Mayer 1913 |
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| Cymbella cistula f. truncata Mayer 1913 |
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| Cymbella cistula f. typica (Meister) Mayer 1913 |
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| Cymbella cistula f. undulata Mayer 1913 |
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| Cymbella ehrenbergii var. naviculoides Mayer 1913 |
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| Cymbella ehrenbergii f. ornata Mayer 1913 |
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| Cymbella gastroides var. genuina Mayer 1913 |
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| Cymbella tumida var. genuina (Grunow) Mayer 1913 |
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| Cymbella ventricosa var. genuina Mayer 1913 |
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| Cymbella ventricosa f. minuta (Hilse in Rabenhorst) Mayer 1913 |
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| Diatoma anceps var. curtum Mayer 1913 |
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| Diatoma anceps var. longissima (Grunow) Mayer 1913 |
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| Diploneis elliptica Mayer 1913 |
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| Diploneis ovalis var. genuina Mayer 1913 |
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| Diploneis ovalis f. genuina Mayer 1913 |
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| Diploneis ovalis var. genuina Mayer 1913 |
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| Diploneis pygmaea Mayer 1913 |
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| Eunotia diodon f. diminuta (Grunow in Van Heurck) Mayer 1913 |
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| Eunotia diodon var. genuina Mayer 1913 |
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| Eunotia exigua var. genuina Mayer 1913 |
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| Eunotia exigua var. minuta Mayer 1913 |
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| Eunotia lunaris var. genuina (Grunow) Mayer 1913 |
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| Eunotia lunaris var. ventralis Mayer 1913 |
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| Eunotia major (maius) (maior) var. genuina Mayer 1913 |
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| Eunotia pectinalis var. genuina Mayer 1913 |
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| Eunotia pectinalis f. impressa (Otto Müller) Mayer 1913 |
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| Eunotia pectinalis f. incisa (Otto Müller) Mayer 1913 |
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| Eunotia pectinalis var. minus (Otto Müller) Mayer 1913 |
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| Eunotia pectinalis var. minus (Otto Müller) Mayer 1913 |
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| Eunotia pectinalis var. pusilla Mayer 1913 |
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| Eunotia praerupta f. curta Mayer 1913 |
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| Eunotia praerupta f. subimpressa Mayer 1913 |
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| Fragilaria capucina var. longissima Mayer 1913 |
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| Fragilaria virescens var. genuina Mayer 1913 |
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| Gomphonema acuminatum var. genuina Mayer 1913 |
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| Gomphonema acuminatum var. intermedia (Dippel) Mayer 1913 |
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| Gomphonema acuminatum f. laticeps (Ehrenberg; Grunow in Van Heurck) Mayer 1913 |
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| Gomphonema angustatum var. genuinum Mayer 1913 |
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| Gomphonema augur var. genuina Mayer 1913 |
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| Gomphonema constrictum f. brevis Mayer 1913 |
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| Gomphonema constrictum var. genuina Mayer 1913 |
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| Gomphonema constrictum var. genuina Mayer 1913 |
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| Gomphonema constrictum var. genuina Mayer 1913 |
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| Gomphonema constrictum f. turgidum (Ehrenberg) Mayer 1913 |
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| Gomphonema gracile var. genuina Mayer 1913 |
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| Gomphonema gracile var. genuina Mayer 1913 |
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| Gomphonema intricatum var. genuina Mayer 1913 |
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| Gomphonema intricatum f. subventricosa (Grunow in Van Heurck) Mayer 1913 |
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| Gomphonema montanum var. genuina Mayer 1913 |
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| Gomphonema montanum var. genuina Mayer 1913 |
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| Gomphonema montanum f. minor Mayer 1913 |
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| Gomphonema olivaceum var. genuinum Mayer 1913 |
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| Gomphonema olivaceum f. inflata Mayer 1913 |
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| Melosira italica f. tenuis Mayer 1913 |
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| Meridion circulare f. gracilis Mayer 1913 |
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| Meridion circulare f. gracilis subf. curvata Mayer 1913 |
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| Navicula americana var. genuina Mayer 1913 |
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| Navicula americana var. parallela Mayer 1913 |
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| Navicula cuspidata f. minor Mayer 1913 |
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| Navicula cuspidata var. minor Mayer 1913 |
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| Navicula cuspidata var. subrostrata (Dippel) Mayer 1913 |
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| Navicula dicephala var. genuina Mayer 1913 |
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| Navicula dicephala var. minor (Grunow in Van Heurck) Mayer 1913 |
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| Navicula dicephala f. pygmaea Mayer 1913 |
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| Navicula gastrum var. genuina Mayer 1913 |
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| Navicula gracilis var. genuina Mayer 1913 |
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| Navicula gracilis f. minor Mayer 1913 |
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| Navicula hungarica var. genuina Mayer 1913 |
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| Navicula peregrina var. genuina Mayer 1913 |
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| Navicula peregrina var. menisculus sensu Mayer 1913 |
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| Navicula peregrina var. upsaliensis (Grunow in Van Heurck) Mayer 1913 |
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| Navicula pseudobacillum Mayer 1913 |
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| Navicula reinhardtii (reinhardti) var. elliptica Mayer 1913 |
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| Navicula reinhardtii (reinhardti) var. genuina Mayer 1913 |
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| Navicula reinhardtii (reinhardti) var. ovalis Mayer 1913 |
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| Navicula rotaeana var. genuina Mayer 1913 |
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| Navicula viridula var. genuina Mayer 1913 |
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| Navicula viridula f. subparallela Mayer 1913 |
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| Neidium affine (affinis) f. brevis Mayer 1913 |
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| Neidium affine (affinis) var. elegans Mayer 1913 |
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| Neidium affine (affinis) var. maxima (maximum) (Cleve) Mayer 1913 |
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| Neidium bisulcatum f. constricta Mayer 1913 |
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| Neidium bisulcatum f. inflata Mayer 1913 |
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| Neidium iridis var. conspicua Mayer 1913 |
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| Neidium iridis var. firma (firmum) (Kützing) Mayer 1913 |
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| Neidium iridis var. genuina Mayer 1913 |
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| Neidium iridis var. maxima (maximum) (Cleve) Mayer 1913 |
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| Neidium productum f. minor Mayer 1913 |
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| Nitzschia amphioxys var. elongata (Hantzsch) Mayer 1913 |
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| Nitzschia amphioxys var. intermedia (Grunow) Mayer 1913 |
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| Nitzschia amphioxys f. major (Grunow in Van Heurck) Mayer 1913 |
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| Nitzschia amphioxys var. pusilla (Grunow) Mayer 1913 |
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| Nitzschia amphioxys var. vivax Mayer 1913 |
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| Nitzschia angustata f. longissima Mayer 1913 |
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| Nitzschia angustata f. longissima Mayer 1913 |
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| Nitzschia angustata (angusta) var. acuminata Mayer 1913 |
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| Nitzschia angustata (angusta) f. acuminata Mayer 1913 |
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| Nitzschia angustata (angusta) f. acuta Mayer 1913 |
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| Nitzschia angustata (angusta) f. amphioxyoides Mayer 1913 |
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| Nitzschia angustata (angusta) f. subconstricta Mayer 1913 |
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| Nitzschia angustata (angusta) f. typica Mayer 1913 |
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| Nitzschia communis var. genuina Mayer 1913 |
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| Nitzschia communis var. minuta (Bleisch) Mayer 1913 |
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| Nitzschia dissipata var. genuina Mayer 1913 |
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| Nitzschia dissipata var. pygmaea Mayer 1913 |
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| Nitzschia linearis f. constricta Mayer 1913 |
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| Nitzschia linearis var. genuina Mayer 1913 |
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| Nitzschia linearis var. serpentina Mayer 1913 |
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| Nitzschia palea var. genuina Mayer 1913 |
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| Nitzschia sigmoidea var. genuina Mayer 1913 |
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| Nitzschia subtilis var. genuina Mayer 1913 |
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| Nitzschia tryblionella f. angustior Mayer 1913 |
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| Nitzschia tryblionella f. constricta Mayer 1913 |
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| Nitzschia tryblionella f. typica Mayer 1913 |
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| Pinnularia acrosphaeria var. genuina Mayer 1913 |
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| Pinnularia acrosphaeria var. minor Mayer 1913 |
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| Pinnularia bavarica Mayer 1913 |
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| Pinnularia borealis var. genuina Mayer 1913 |
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| Pinnularia brevicostata var. genuina Mayer 1913 |
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| Pinnularia cocconeiformis Mayer 1913 |
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| Pinnularia divergens var. genuina Mayer 1913 |
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| Pinnularia divergens f. major (maior) Mayer 1913 |
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| Pinnularia divergens f. minor Mayer 1913 |
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| Pinnularia divergens var. minor Mayer 1913 |
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| Pinnularia divergens var. subundulata Mayer 1913 |
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| Pinnularia gibba var. genuina Mayer 1913 |
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| Pinnularia gibba var. neglecta Mayer 1913 |
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| Pinnularia gibba var. peckii (Rabenhorst) Mayer 1913 |
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| Pinnularia hemiptera var. genuina Mayer 1913 |
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| Pinnularia interrupta var. bicapitata (Lagerstedt) Mayer 1913 |
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| Pinnularia interrupta var. genuina Mayer 1913 |
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| Pinnularia legumen var. genuina Mayer 1913 |
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| Pinnularia legumen f. interrupta Mayer 1913 |
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| Pinnularia legumen f. minor Mayer 1913 |
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| Pinnularia legumen f. normalis Mayer 1913 |
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| Pinnularia legumen f. stauroptera Mayer 1913 |
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| Pinnularia legumen var. subcapitata Mayer 1913 |
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| Pinnularia legumen var. subsolaris Mayer 1913 |
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| Pinnularia legumen var. undula (Schumann) Mayer 1913 |
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| Pinnularia major (maior) f. crucigera Mayer 1913 |
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| Pinnularia major (maior) var. genuina Mayer 1913 |
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| Pinnularia major (maior) var. leptogongyla (Ehrenberg) Mayer 1913 |
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| Pinnularia major (maior) var. neglecta Mayer 1913 |
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| Pinnularia major (maior) f. semicruciata Mayer 1913 |
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| Pinnularia major (maior) f. subconstricta Mayer 1913 |
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| Pinnularia mesogongyla f. minor Mayer 1913 |
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| Pinnularia mesolepta var. constricta (Grunow) Mayer 1913 |
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| Pinnularia mesolepta f. interrupta Mayer 1913 |
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| Pinnularia mesolepta var. recta Mayer 1913 |
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| Pinnularia mesolepta f. semicruciata Mayer 1913 |
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| Pinnularia mesolepta f. typica Mayer 1913 |
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| Pinnularia mesolepta f. vixundulata (vix undulata) Mayer 1913 |
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| Pinnularia microstauron f. abnormis Mayer 1913 |
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| Pinnularia microstauron var. biundulata (Otto Müller) Mayer 1913 |
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| Pinnularia microstauron var. brebissonii (Kützing) Mayer 1913 |
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| Pinnularia microstauron subsp. brebissonii Mayer 1913 |
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| Pinnularia microstauron var. capitata Mayer 1913 |
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| Pinnularia microstauron var. capitata Mayer 1913 |
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| Pinnularia microstauron f. curta Mayer 1913 |
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| Pinnularia microstauron var. diminuta (Grunow in Van Heurck) Mayer 1913 |
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| Pinnularia microstauron subsp. eumicrostauron Mayer 1913 |
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| Pinnularia microstauron var. genuina Mayer 1913 |
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| Pinnularia microstauron var. genuina Mayer 1913 |
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| Pinnularia microstauron f genuina Mayer 1913 |
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| Pinnularia microstauron var. lanceolata Mayer 1913 |
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| Pinnularia microstauron f. lanceolata Mayer 1913 |
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| Pinnularia microstauron var. lanceolata Mayer 1913 |
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| Pinnularia microstauron var. lanceolata Mayer 1913 |
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| Pinnularia microstauron var. linearis (Otto Müller) Mayer 1913 |
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| Pinnularia microstauron f. minor Mayer 1913 |
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| Pinnularia microstauron f. minor Mayer 1913 |
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| Pinnularia microstauron f. normalis Mayer 1913 |
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| Pinnularia microstauron var. notata (M. Peragallo & Heribaud in Heribaud) Mayer 1913 |
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| Pinnularia microstauron var. ovalis Mayer 1913 |
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| Pinnularia microstauron f. pygmaea Mayer 1913 |
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| Pinnularia microstauron f. semicruciata Mayer 1913 |
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| Pinnularia nobilis f. brevis Mayer 1913 |
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| Pinnularia nobilis var. genuina Mayer 1913 |
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| Pinnularia nobilis var. intermedia (Dippel) Mayer 1913 |
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| Pinnularia nodosa var. genuina (Cleve) Mayer 1913 |
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| Pinnularia nodosa f. interrupta Mayer 1913 |
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| Pinnularia nodosa f. interrupta Mayer 1913 |
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| Pinnularia nodosa f. interrupta Mayer 1913 |
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| Pinnularia nodosa var. minor Mayer 1913 |
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| Pinnularia nodosa var. pseudogracillima Mayer 1913 |
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| Pinnularia nodosa f. semicruciata Mayer 1913 |
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| Pinnularia nodosa f. semicruciata Mayer 1913 |
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| Pinnularia oblonga var. acuminata (Grunow) Mayer 1913 |
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| Pinnularia oblonga var. genuina (Grunow) Mayer 1913 |
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| Pinnularia oblonga var. lanceolata (Grunow) Mayer 1913 |
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| Pinnularia platycephala var. genuina Mayer 1913 |
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| Pinnularia platycephala var. minor Mayer 1913 |
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| Pinnularia protracta (Grunow in Cleve & Grunow) Mayer 1913 |
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| Pinnularia stauroptera f. parva (Grunow) Mayer 1913 |
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| Pinnularia stauroptera var. subundulata Mayer 1913 |
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| Pinnularia stauroptera var. tabellarioides Mayer 1913 |
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| Pinnularia subcapitata var. genuina Mayer 1913 |
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| Pinnularia viridis f. cruciata Mayer 1913 |
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| Pinnularia viridis f. cruciata Mayer 1913 |
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| Pinnularia viridis var. diminuta Mayer 1913 |
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| Pleurostauron (Pleurostaurum) smithii f. minor Mayer 1913 |
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| Rhopalodia gibba var. genuina (Grunow) Mayer 1913 |
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| Rhopalodia gibba f. gracilis Mayer 1913 |
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| Rhopalodia gibba f. ovalis Mayer 1913 |
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| Rhopalodia gibba var. ventricosa (Kützing) Mayer 1913 |
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| Rhopalodia gibberula var. genuina (Grunow) Mayer 1913 |
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| Rhopalodia gibberula var. producta (Grunow) Mayer 1913 |
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| Stauroneis anceps f. elongata Mayer 1913 |
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| Stauroneis anceps f. extrema Mayer 1913 |
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| Stauroneis anceps var. genuina Mayer 1913 |
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| Stauroneis anceps f. gracilis (Rabenhorst) Mayer 1913 |
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| Stauroneis anceps var. lata Mayer 1913 |
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| Stauroneis anceps var. rhomboidalis Mayer 1913 |
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| Stauroneis phoenicenteron f. lanceolata Mayer 1913 |
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| Stenopterobia intermedia var. bleischii (Janisch) Mayer 1913 |
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| Surirella gracilis var. genuina Mayer 1913 |
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| Surirella gracilis var. ratisbonensis Mayer 1913 |
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| Surirella hustedtiana Mayer 1913 |
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| Surirella linearis var. genuina Mayer 1913 |
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| Surirella nervosa (Schmidt in Schmidt et al.) Mayer 1913 |
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| Surirella ovalis f. aequalis (Kutzing ex Van Heurck) Mayer 1913 |
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| Surirella ovalis var. ambigua Mayer 1913 |
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| Surirella ovalis f. intermedia (Rabenhorst) Mayer 1913 |
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| Surirella ovalis f. ovata Mayer 1913 |
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| Surirella ovalis var. pseudopinnata Mayer 1913 |
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| Surirella ovalis f. subconstricta Mayer 1913 |
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| Surirella ovalis f. typica Mayer 1913 |
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| Surirella ovalis f. typica Mayer 1913 |
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| Surirella splendida var. minor (Dippel) Mayer 1913 |
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| Surirella splendida var. saxonica (Auerswald ex Rabenhorst) Mayer 1913 |
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| Surirella tenera var. genuina Mayer 1913 |
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| Surirella tenera var. pusilla Mayer 1913 |
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| Surirella (Suriraya) angusta (angustata) var. pygmaea Mayer 1913 |
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| Surirella (Suriraya) biseriata var. genuina Mayer 1913 |
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| Surirella (Suriraya) biseriata f. margaritifera Mayer 1913 |
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| Surirella (Suriraya) biseriata f. minor Mayer 1913 |
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| Surirella (Suriraya) elegans f. constricta Mayer 1913 |
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| Surirella (Suriraya) elegans var. genuina Mayer 1913 |
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| Surirella (Suriraya) elegans f. obtusa Mayer 1913 |
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| Surirella (Suriraya) elegans var. subaequalis Mayer 1913 |
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| Surirella (Suriraya) elegans f. typica Mayer 1913 |
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| Synedra acus var. genuina Mayer 1913 |
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| Synedra ulna var. acus Mayer 1913 |
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| Synedra ulna f. constricta Mayer 1913 |
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| Synedra ulna f. pygmaea Mayer 1913 |
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| Synedra ulna f. rostrata Mayer 1913 |
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| Synedra ulna f. typica Mayer 1913 |
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