Gloeocystis

Gloeocystis is a genus of green algae in the family Radiococcaceae. Members of this genus are widely distributed and found in the plankton of freshwaters, in soil or mosses, or on rocks or wood. Gloeocystis consists of colonies of cells embedded in an irregular mucilaginous envelope. The mucilaginous material is typically lamellate, i.e. forms concentric layers around cells or groups of cells. Cells are spherical to ovoid, with smooth cell walls. Cells have a single nucleus and one parietal chloroplast with a single pyrenoid. Asexual reproduction occurs via the formation of autospores; two to eight (sometimes 16) are formed per cell. Daughter cells are released when the mother cell wall gelatinizes. One species, G. banneerghattensis, also produces brown, thick-walled akinetes....read more on Wikipedia.