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SUMMARY1. Two fungi of the genus Nidula have been studied in single-spore culture for the first time. These are the North American species N. candida and N. microcarpa.2. Both species display the tetrapolar heterothallic pattern of sexuality as do all other members of the Nidulariaceae studied up to the present time.3. The characteristics of the mycelia of Nidula appear to indicate a closer relationship to Crucibulum and Nidularia than to Cyathus.4. N. candida and N. microcarpa display four major differences in the growth habits of their mycelia.
Harold J. Brodie (Tue,) studied this question.