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Page number:307 
Remarks (public):The dextrinoid skeletal hyphae, the simple septate generative hyphae, the cuticle on the pileus. and the asperulate spores make Heterobasidion a distinct genus. The type species is a major root-rot pathogen in conifer forests and plantations in the Northern hemisphere.
There are different mating types or races of H. annosum in Europe with a slight difference in selection of hosts. However, these differences do not warrant an acceptance of more than one species in Europe. See Korhonen 1978 for details.
 
Description type:Non-original description 
Description:HETEROBASIDION Bref. - Unters. Gesamtg. Mykol. 8:154, 1888.
Basidiocarps perennial. resupinate to pileate. widely effused and tough; pilear surface at first light brown and finely tomentose, soon darker and smooth with a distinct thin black cuticle; pore surface light cream, pores regular, round to angular, mostly small, glancing; context white to light cream. dark reddish brown with Melzer's reagent; hyphal system dimitic; generative hyphae delicately thin-walled, simple septate, clamps occurring in culture; skeletal hyphae dominating in the basidiocarp, dextrinoid, unbranched or with a few branches; cystidia none; basidiospores broadly ellipsoid to globose. hyaline. thin to slightly thick-walled, finely asperulate, negative in Melzer's reagent; causing a white rot and butt rot of living conifers. On living and dead trees, predominantly conifers; temperate to boreal genus with one species in Europe.
Type species: Polyporus annosus Fr.
 
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