| WebNameShort | |
| Gloeonema triangulatum 'Ehrenberg' according to Mills 1934 |
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| Glyphodesmis loczyi (Pantocsek) F.W. Mills 1934 |
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| Gomphonema acuminatum f. curta F.W. Mills 1934 |
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| Gomphonema acuminatum var. hastata (A. Cleve) F.W. Mills 1934 |
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| Gomphonema aschersonii (Otto Müller) F.W. Mills 1934 |
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| Gomphonema geminatum var. strictum (stricta) (M. Schmidt in Schmidt et al.) F.W. Mills 1934 |
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| Gomphonema gracile var. clavata (Ehrenberg) F.W. Mills 1934 |
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| Gomphonema herculeanum var. clavatum (Cleve; M. Schmidt in Schmidt et al.) F.W. Mills 1934 |
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| Gomphonema herculeanum var. rostrata (Tempère & Peragallo) F.W. Mills 1934 |
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| Gomphonema herculeanum var. septiceps (M. Schmidt in Schmidt et al.) F.W. Mills 1934 |
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| Gomphonema ruttneri (Hustedt in Schmidt et al.) F.W. Mills 1934 |
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| Gomphopleura pfeifferi (pfeifferii) (Østrup) F.W. Mills 1934 |
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| Grunoviella (Grunowiella) pacifica (Grunow) F.W. Mills 1934 |
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| Guinardia stephanos (Hensen) F.W. Mills 1934 |
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| Gyrosigma angustum var. subflexuosa (Grunow ex Cleve) F.W. Mills 1934 |
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| Gyrosigma arcticum var. subflexuosa (Grunow ex Cleve) F.W. Mills 1934 |
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| Odontidium paradoxum (Ehrenberg) F.W. Mills 1934 |
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