This state is talking about Algae.
Indeed, the algae can be classified according to their pigmentation. In the broadest sense of the term, algae gather:
* Prokaryotic organisms: Cyanobacteria (formerly called "blue-green algae" or Cyanophyceae);
* Eukaryotes:
-various groups with unicellular species (Euglenophytes, Cryptophytes, Haptophytes, Glaucophytes, etc.),
-other groups with unicellular or multicellular species:
"red algae" or Rhodophyta,
Stramenopiles (including diatoms and "brown algae" or Phéophycées),
-and finally, plants quite close to terrestrial plants: "green algae", which include, among others, Ulvophyceae.
