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Remarks (public):The simple-septate hyphae and the pinkish to purplish colours are diagnostic characters for this species. It may be taken microscopically for a Ceriporia, all species of which are white rot fungi. 
Description type:Non-original description 
Description:Leptoporus mollis (Pers.:Fr.) Quel. - Ench. Fung. p. 176. 1886. - Boletus mollis Pers., Ann. Bot. (Usteri) 15:22, 1795. - Polyporus mollis Pers.: Fr., Syst. Mycol. 1:360, 1821.
Basidiocarps sessile, effused-reflexed, or rarely resupinate, pilei solitary. dimidiate to elongate, up to 1 x 3 x 2 cm; upper surface pinkish white or pale reddish purple at first, becoming purplish brown, faintly tomentose to glabrous, azonate, becoming rugose with age, margin concolorous or cream-coloured next to the substratum on resupinate or effused-reflexed specimens; pore surface white to pale reddish purple, becoming dark purplish brown, the pores circular to angular, 3-4 per mm, with thick, entire dissepiments; context cream colored to pinkish buff, becoming pale pinkish brown, faintly zonate or azonate, soft and felty, up to 7 mm thick; tube layer drying dark purplish-brown, distinct from context, up to 1 cm thick.
Hyphal system monomitic; contextual generative hyphae thin- to thick-walled, simple-septate, with rare to frequent branching, 2.5-5 µm in diam; tramal hyphae similar; gloeoplerous hyphae also present.
Cystidia or other sterile hymenial elements lacking.
Basidia clavate, 4-sterigmate, 16-20 x 4-5 µm, simple-septate at the base. Basidiospores allantoid, hyaline, smooth, negative in Melzer's reagent, 5-6 x 1.5-2 µm. Type of rot. Brown cubical rot of dead conifers, negative in gum guaiac solution. Cultural characteristics. See Nobles 1948, 1958, 1965; Stalpers 1978.
Sexuality. Unknown.
Substrata. Dead wood of conifers such as Abies. Larix, Picea and Pinus. In North America also reported from Pseudotsuga.
Distribution. The species seems to follow Picea and Pinus everywhere, but in North Europe it seems to be more frequent on Picea where this host occurs. Circumboreal in conifer forests through Asia and North America.
 
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