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| Placoneis mutica var. geoppertiana (Bleisch in Rabenhorst) Mereschkowsky 1903 |
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| Placoneis mutica var. producta (Cleve & Grunow) Mereschkowsky 1903 |
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| Placoneis lundstroemii (Cleve in Cleve & Grunow) Mereschkowsky 1903 |
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| Placoneis mutica var. legumen (Cleve) Mereschkowsky 1903 |
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| Placoneis protracta var. maxima (Cleve) Mereschkowsky 1903 |
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| Placoneis subinflata var. elliptica (Cleve) Mereschkowsky 1903 |
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| Placoneis gastrum (Ehrenberg) Mereschkowsky 1903 |
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| Placoneis placentula (Ehrenberg) Mereschkowsky 1903 |
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| Placoneis dicephala var. elginensis (Gregory) Mereschkowsky 1903 |
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| Placoneis exigua (Gregory) Mereschkowsky 1903 |
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| Placoneis gastrum var. exigua (Gregory) Mereschkowsky 1903 |
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| Placoneis gastrum var. jenisseyensis (Grunow in Cleve & Grunow) Mereschkowsky 1903 |
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| Placoneis gastrum var. latiuscula (Grunow in Cleve & Grunow) Mereschkowsky 1903 |
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| Placoneis protracta (Grunow in Cleve & Grunow) Mereschkowsky 1903 |
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| Placoneis subsalsa var. obtusata (Grunow in Cleve & Grunow) Mereschkowsky 1903 |
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| Placoneis lundstroemii var. frieseana (Grunow in Cleve & Möller) Mereschkowsky 1903 |
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| Placoneis mutica var. peguana (Grunow in Cleve & Möller) Mereschkowsky 1903 |
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| Placoneis subinflata (Grunow in Cleve & Möller) Mereschkowsky 1903 |
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| Placoneis dicephala var. subcapitata (Grunow) Mereschkowsky 1903 |
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| Placoneis subsalsa var. minuta (Grunow) Mereschkowsky 1903 |
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