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A histrical review on the taxonomy of Cryptococcus neoformans was presented. And a total of 27 strains of C. neoformans, of which 26 were isolated from clinicl material and 1 from dropping of pigeon in Japan, were studied. After three to four weeks incubation on yeast extract-sucrose-biotin agar, 21 out of 27 strains did not produce a hypha at all, but showed only globular cells; 3 developed a germtube; two put forth short hyphae. The remaining 1 strain generated hyphae having clamp-connections, basidia and basidiospores; this strain was thus found to be self-fertile, while 26 others were all self-sterile. In the mating study of these strains, 24 were compatible and 2 were imcompatible. All of the strains "compatible" were α-type of Filobasidiella neoformans. None of a-type of F. neoformans and F. bacillispora were seen. By serotype, 26 strains were A-type and only one was the type A-D. The types B and C were nil. The type A-D strain isolated from dropping of pigeon in kyoto was self-fertile. In the United States, three "self-ferile" strains have so far been reported, however, all of them are those isolated from clinical lesions. This presents an impressive contrast to our strain isolated from natural substrate. Additional tests such as assimilation test, fermentation thest, urease test, DNase test, test on production of starch-like compounds or test on growth at 37°C were carried out. The results of all of these tests were consistent with standard strains.
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