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Cosmarium abbreviatum var. germanicum
Variety, Alga, Terrestrial
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Cosmarium abbreviatum var. minus
Variety, Alga, Terrestrial
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Cosmarium abbreviatum var. planctonicum
Variety, Alga, Terrestrial
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Cosmarium abruptum
Species, Alga, Terrestrial
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Cosmarium adoxum
Species, Alga, Terrestrial
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Cosmarium alpestre
Species, Alga, Terrestrial
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Cosmarium amoenum
Species, Alga, Terrestrial
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Cosmarium amoenum var. mediolaeve
Variety, Alga, Terrestrial
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Cosmarium anceps
Species, Alga, Terrestrial
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Cosmarium anceps var. crispulum
Variety, Alga, Terrestrial
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Cosmarium anceps var. tatricoides
Variety, Alga, Terrestrial
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Cosmarium angulare
Species, Alga, Terrestrial
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Cosmarium angulare var. octangulare
Variety, Alga, Terrestrial
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Cosmarium angulosum
Species, Alga, Terrestrial
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Cosmarium angulosum var. concinnum
Variety, Alga, Terrestrial
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Cosmarium anisochondrum
Species, Alga, Terrestrial
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Cosmarium annulatum
Species, Alga, Terrestrial
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Cosmarium annulatum var. eIegans
Variety, Alga, Terrestrial
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Cosmarium arctoum
Species, Alga, Terrestrial
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Cosmarium arctoum forma minor
Form, Alga, Terrestrial