Abstract
SUMMARY: After the death of Dr. Gilbert M. Smith on July 11, 1959, the strains of Chlamydomonas maintained in his collection were sent to the Culture Collection of Algae at Indiana University. Axenic cultures of 29 strains were investigated to determine the nature of their sexual behavior. Mating types for 6 species (C. elliptica var. britannica, C. frankii, C. minutissima, C. moewusii f. microstigmata, C. reinhardtii, C. smithii) produced zygotes when agar cultures were harvested with sterile distilled water or low nitrogen medium and the complementary mating types for each species were mixed. Three species, C. moewusii f. microstigmata, C. reinhardtii, and C. smithii, produced sufficient zygotes to be of value in experimental work. C. smithii is an undescribed species interfertile with C. reinhardtii. The description of C. smithii will be published in a separate paper. Fourteen mating types of Chlamydomonas originally isolated and maintained by Smith are now maintained in the Culture Collection.

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