One [female] clone of S. donnellii, proving fertile in matings with various [male] clones, yielded sporophytes, most of the spores from which, so far as tested, failed to germinate. One sporophyte, however, yielded spores (in tetrads) a considerable proportion of which germinated. These spores gave rise to a preponderance of [female][female]; of 23 tetrads producing sporelings whose sex was determined, 6 gave rise each to 4 [female][female]; 5 gave rise each to 3 [female][female].[long dash]The maternal clone was diploid; its chromosome complement was 14 autosomes and 2 X-chromosomes, whereas an ordinary [female] gametophyte possesses 7 autosomes and 1 X-chromosome. This seems to complete the list of possible diploid gametophytes in this species. One [male] had previously been found with 14 autosomes and 2 Y''s, and a considerable number of intersexes have appeared with 14 autosomes, 1 X, and 1 Y.