Three intersterility groups of Armillaria mellea sensu lato were discovered by examining all pairwise combinations of monosporous isolates of basidiomes collected in Hokkaido. One of them, group IV, was identified as A. sinapina by mating it with tester strains. Two new species, groups III and V, were named A. jezoensis and A. singula, respectively. Their morphological forms and the ecology of their basidiomes are described.
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Young et al. (1994) studied this question.
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