Desmococcus is a genus of green algae in the family Stichococcaceae.

After being redescribed in various other genera such as Pleurococcus or Protococcus, the genus was described in 1925 by F. Brand with D. vulgaris as its type.

Desmococcus differs from Stichococcus and its congeners in morphology (having sarcinoid colonies or short branched filaments, and the ability to produce zoospores).

[4] Desmococcus consists of cells found in cuboidal packets (sarcinoid habit) or short branched uniseriate filaments.

[5] Asexual reproduction occurs by the production of aplanospores 4-flagellate zoospores which are produced in large, spherical sporangia; the sporangia have a punctate, verrucose, or smooth outer cell wall.