green alga Definition

any of a division (Chlorophyta) of green-colored algae that have chloroplasts and occur especially in fresh water

cyanobacterium

any of a major group (Cyanobacteria) of photosynthetic bacteria that are single-celled but often form colonies in the form of filaments, sheets, or spheres and are found in diverse environments (such as salt and fresh water, soils, and on rocks) —called also blue-green alga

any of a class (Xanthophyceae of the division Chrysophyta) of algae with the chlorophyll masked by brown or yellow pigment