Heterothallism in Dictyuchus, a Genus of the Water Moulds1

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Abstract
The author isolated strains of Dictyuchus which, when grown separately, are sterile but when grown together form oogonia and antheridia. In the 26 strains collected, 6 were [feamle], 9 were [male], and 11 were neutral. One strain was reported for the 1st time, which formed parthenogenetic eggs when grown alone, but antheridia which applied themselves to the oogonia of strain A [female] . Opposite strains of apparently different species may be intercrossed. In crosses with Dictyuchus strain A and Thraustotheca primoachlya, oogonial initials and antheridial branches were formed. Dictyuchus eggs were germinated and successful experimentation was done to determine when sexual segregation took place. The stimulus which causes formation of reproductive bodies was found to be that of contact; external conditions are believed to have a secondary and variable effect in influencing sexual reproduction.

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