Chlamyclomonas smithii sp. nov. is described from two strains of Chlamyclomonas originally isolated by Dr. Gilbert M. Smith. The mating types are inter-fertile with those of Chlamyclomonas reinhardtii (Culture No. 89 and 90) maintained in the Culture Collection of Algae at Indiana University. This species is distinguished from all others by the body shape and slit chromatophore.
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