Acrochaetiales

Audouinella, also known as black algae, is a widespread genus of red algae, found in marine and freshwater environments.

Acrochaetiales is an order of red algae.

Acrochaetium is a genus of marine red alga.

Rhodochorton is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips.