TOWARDS A REVISION OF THE SYSTEMATICS OF THE GENUS CHLAMYDOMONAS (CHLOROPHYTA) .1. CHLAMYDOMONAS-APPLANATA PRINGSHEIM

Strains of Chlamydomonas with cross-reacting sporangium wall autolysins also correspond in morphology, reproduction, development, and physiological properties. We therefore undertook a revision of the systematics of the genus based on this correlation. Isolates of Chlamydomonas available in culture collections were re-examined microscopically, preferably with respect to their reproduction and development. In particular all authentic cultures, i.e. the original clones, on which earlier species diagnoses had been founded, were included. Their detectable autolysins were tested crosswise in bioassays. We intend to complete and extend species diagnoses in order to separate species more precisely. - At first 7 strains with a common sporangium autolysin have been examined, four of which are the authentic cultures of the species C aggregata Deason et Bold, C. akinetos Deason et Bold, C applanata Pringsheim, and C humicola Lucksch. They have been brought together under the name of the species first described, C applanata Pringsheim, due to their apparent similarities in morphology and development. An amended species diagnosis is presented. The significance of authentic cultures as important sources of further information is discussed.