Heterothallism in Blakeslea Trispora

Abstract

Blakeslea trispora Thaxter, which has hitherto been known only in the sporangial stage, has been found to produce zygospores. Zygospore production is dependent upon the presence of the plus (+) and minus (-) strains. The only apparent difference in the two strains is the ability of the one to produce sporangia in greater abundance.