New morphological features of the members of genus Stichococcus Nдgeli (Trebouxiophyceae, Chlorophyta)

The results of study of 31 strains of green algae from ACKU collection represented by original isolates as well as by subcultures deposited in international collections of strains of the genus Stichococcus Nägeli are reported. In 19 strains previously undescribed mucous structures have been founded, viz colonial mucilage, mucous sheath, mucous grains and mucous caps whose presence are inconsistent with the author’s diagnosis of this genus and confirms the assumption of phylogenetic heterogeneity of this genus at the phenotypic level.