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Microscopical examination revealed that basidia of Hypsizygus marmoreus,strain SIEF3133,produced four basidiospores.Data obtained from mating tests conducted with 78 basidiospore monokaryons indicated that H.marmoreus has a tetrapolar mating system under the control of two genetic factors,A and B.X2 tests indicated that the distribution of the four mating types among spore monokaryons was in accordance with the 1∶1∶1∶1 law of segregation.In addition,new types of A and B factors,originating through recombination within the respective mating-type factors during sexual reproduction,were detected at a rate of 1.3%.
Microscopical examination revealed that basidia of Hypsizygus marmoreus, strain SIEF3133, produced four basidiospores. Data obtained from mating tests conducted with 78 basidiospore monokaryons indicated that H.marmoreus has a tetrapolar mating system under the control of two genetic factors, A and B.X2 tests indicated that the distribution of the four mating types among spore monokaryons was in accordance with the 1: 1: 1 law of segregation. In addition, new types of A and B factors, originating through recombination within the respective mating-type factors during Aged reproduction, were detected at a rate of 1.3%.