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Page number:596 
Description type:Non-original description 
Description:Serpula himantioides (Fr.) P. Karst., Meddn Soc. Fauna Flora fenn. 11: 21, 1885.
Bas.: Merulius himantioides Fr., Observ. mycol. (Havniae) 2: 238, 1818.
Basidiome resupinate, effused, membranaceous, up to 2 mm thick, hymenophore at first more or less smooth with prominent yellowish ridges, then merulioid, dark brown, margin distinctly white, arachnoid or with thin rhizomorphs. Hyphal system dimitic, generative hyphae with clamps, subhymenial hyphae thin-walled, 2-4 µm wide, compacted but distinct and not gelatinized, subicular hyphae with some ampullate clamps, thin-walled, often wider, swelling up to 10-12 µm wide, skeletals rare in subiculum, frequent in rhizomorphs, 2-3.5 µm wide, thick-walled. Cystidia absent. Basidia clavate to cylindrical, 35-60 x 6-9 µm, with 4-sterigmata and a basal clamp. Basidiospores narrowly ellipsoid, 9-12 x 5-6 µm, smooth, thick-walled, yellowish to brownish, some weakly dextrinoid, cyanophilous.
Distribution in Europe: Russia, Estonia, France, Germany, Belarus, Poland, United Kingdom, Belgium, Slovenia, Romania, Bulgaria, Portugal, Sweden, Denmark, Norway, Finland, Spain, Ukraine, Russia, and the Caucasus. Known in Italy from Lombardia, Trentino Alto-Adige, Emilia-Romagna, Toscana, and Lazio.
Substrata: on stumps of Picea abies and lying trunks of Pinus pinea.
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