The genus Cystococcus, according to Chodat (1913), is characterized by the presence of a pyrenoid and by reproduction with zoospores and is identical with Pleurococcus vulgaris Menegh. (non Naeg.), though Wille regards Meneghini’s species as of mixed content. Paulson and Hastings (1920) now find that Chodat’s pyrenoid is the nucleus of the cell. |