Eastern North American Population Research Articles

Speciation in thePeniophora CinereaComplex

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.

Speciation in the Peniophora cinerea Complex

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.

A clarification of the chromosome number situation in Sanguisorba canadensis

Although eastern North American populations of Sanguisorba canadensis L. are reported to be octoploid and plants of western North America reported to be tetraploid, it was found that this species is usually tetraploid, 2n = 28, throughout its range. No octoploids were found among the plants studied, even in material from the locations where octoploids have been reported to occur.