Abstract
A taxonomic re-evaluation of the Ceratobasidium-Rhizoctonia group suggests that Ceratobasidium contains only the type species C. calosporum, which deviates in micromorphological and ultrastructural characters from all other species so far included in that genus. Rhizoctonia species are compared with the type species of Ceratobasidium, Cejpomyces, Oncobasidium, Tofispora, Waitea, and Ypsilonidium. The micromorphology, ultrastructure, cellular interaction with the host, and molecular phylogeny of a Rhizoctonia species parasitic on needles and young shoots of Picea abies have been studied. The parasite has been known for a long time, but misinterpreted, and not named so far. Rhizoctonia butinii is described and compared with related species of the genus.
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