| Synonym/Old Name | New Name | Taxonomy Group | ||
|---|---|---|---|---|
 | Achnanthes quadricauda | Scenedesmus quadricauda | Chlorophyta | more info |
 | Aegagropila linnaei | Aegagropila brownii | Chlorophyta | more info |
 | Agarophyton chilense | Gracilaria chilensis | Rhodophyta | more info |
 | Aglaophyllum punctatum | Nitophyllum punctatum | Rhodophyta | more info |
 | Aglaothamnion roseum | Gaillona rosea | Rhodophyta | more info |
 | Aglaothamnion sepositum | Gaillona seposita | Rhodophyta | more info |
 | Ahnfeltia gigartinoides | Ahnfeltiopsis gigartinoides | Rhodophyta | more info |
 | Ahnfeltiopsis paradoxa | Besa paradoxa | Rhodophyta | more info |
 | Alaria macroptera | Alaria esculenta | Phaeophyceae | more info |
 | Alaria membranacea | Alaria pylaiei | Phaeophyceae | more info |
 | Alaria pinnatifida | Undaria pinnatifida | Phaeophyceae | more info |
 | Alaria tenuifolia | Alaria marginata | Phaeophyceae | more info |
 | Anabaena azollae | Trichormus azollae | Cyanobacteria | more info |
 | Anabaena oscillarioides | Dolichospermum flos-aquae | Cyanobacteria | more info |
 | Anabaena spiroides | Dolichospermum spiroides | Cyanobacteria | more info |
 | Anabaena variabilis | Trichormus variabilis | Cyanobacteria | more info |
 | Ankistrodesmus gracilis | Messastrum gracile | Chlorophyta | more info |
 | Antithamnion plumula | Pterothamnion plumula | Rhodophyta | more info |
 | Arthrospira amethystina | more info | ||
 | Arthrospira maxima | Limnospira maxima | Cyanobacteria | more info |
Credits to Prof Leonel Pereira
