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ABSTRACT
Mating tests were performed in vitro to determine interfertility patterns among eastern North American populations of Peniophora cinera, and two sympatric sibling species of the P. cinerea complex in Europe. No intersterile groups were detected in eastern North America. Reproductive isolation between the two European species reported previously by Hallenberg was verified. Since one sibling species is apparently restricted to the wood of Fagus sylvatica, speciation accompanied by substratum specialization is indicated. Intercontinental pairings showed that American P. cinerea is partially reproductively isolated from the two European sibling species.