Abstract
Typhula ishikariensis isolates were collected from various parts of Hokkaido. There were two genetically different groups which did not mate with each other; one was termed biotype A, and the other was further divided into two by cultural characteristics, i.e., biotypes B and C. Biotype A was identical to T. ishikariensis and T. ishikariensis var. ishikariensis. Biotype B was not identical to T. idahoensis or T. ishikariensis var. idahoensis. Biotype C was similar to T. ishikariensis var. canadensis. Biotype A tended to occur inland where deep snow cover lasts for a long time. Biotype B was obtained mainly from the coastal regions where snow cover is thin and short in time. The distribution of biotype C was irregular. Taxonomic significance of the genetics and allopatry in the T. ishikariensis complex is discussed.
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