Biosystematics of Coriolus hirsutus and C. pubescens. I. Interfertility studies

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Abstract
Interfertility tests between Alberta collections identified as Coriolus hirsutus, C. pubescens, C. velutinus, C. zonatus, and C. versicolor have shown that there are only two distinct species of this complex in Alberta, each with a range of morphological variation. Both these species, which are being called Coriolus hirsutus and C. pubescens, have the tetrapolar type of fertility. Isolates of basidiocarps from Sweden identified as Coriolus hirsutus were intersterile with Alberta isolates of this species, which suggests the existence of two different species. Cultures of C. versicolor (Ontario) were unilaterally dikaryotized by C. hirsutus and to a lesser extent by C. pubescens, indicating very close relationship. Dark pigment lines frequently formed between paired isolates of both distantly related and closely related cultures, indicating that it is not mating-type factors which control pigment formation in the contact zone.

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