botrydium is a genus of thalloid algae. specimens can reach around 2 mm in size and produce tetraspores.

algae amoeba anatomy animal aquatic asconoid biology body botrydium cavity cell choanocytes eukaryotic flagella genus green health illustration isolated known life multicellular nature organic organism pore primitive root sandal science severely shape single specimens sponge sponges spongocoel spores stalk structure surrounded tetraspores thalloid tube unicellular water zoology