Abstract
SUMMARYEighteen dikaryotic isolates of Fomes cajanderi Karst, from widely distributed stations in North America were utilized in a study of some aspects of sexuality in that species. Its previously reported heterothallic, bipolar mating system and genetic isolation from Fomes roseus (Alb. & Schw. ex Fr.) Karst, were confirmed. Thirty-six monokaryotic isolates obtained from these 18 dikaryotic isolates were paired in all combinations and 25 mating types were found in the sample. The number of incompatibility factors in the population was estimated to be 33. Fruiting and pairing reactions were also studied. Basidiocarp primordia developed in some monokaryotic isolates but had no hymenium. Apparent dikaryotization of the monokaryon constituents in a series of 35 di-mon pairings was observed in all but four pairings.
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