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Acanthoica
Genus, Alga, Marine
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Acrochaete
Genus, Alga, Marine
-
Acrochaetium
Genus, Alga, Marine, terrestrial
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Acrosiphonia
Genus, Alga, Marine
-
Acrosorium
Genus, Alga, Marine
-
Actinastrum
Genus, Alga, Marine, terrestrial
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Acutodesmus
Genus, Alga, Marine, terrestrial
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Aegagropila
Genus, Alga, Marine, terrestrial
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Agardhiella
Genus, Alga, Marine
-
Agarophyton non-native
Genus, Alga, Marine
-
Aglaothamnion
Genus, Alga, Marine
-
Ahnfeltia
Genus, Alga, Marine
-
Ahnfeltiopsis
Genus, Alga, Marine
-
Amphiroa
Genus, Alga, Marine
-
Anadyomene non-native
Genus, Alga, Marine
-
Anotrichium
Genus, Alga, Marine
-
Antithamnion
Genus, Alga, Marine
-
Antithamnionella
Genus, Alga, Marine
-
Apoglossocolax
Genus, Alga, Marine
-
Apoglossum
Genus, Alga, Marine