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Page number:86 
Remarks (internal):Despite its great variability, B. corium is easily distinguished due to characteristic parchment basidiocarps and ceraceous merulioid hymenium with pale ochraceous tints. Sometimes the hymenial folds look like small dummies, and, in some cases, the hymenium has an irpicoid appearance.
These forms were reported by Corner (1971) for the paleotropics, but in 1993 an irpicoid specimen was found in St. Petersburg (northwest Russia). The coloration of the hymenium varies considerably, but an ochraceous-pinkish tint remains rather constant. In some cases, prostrate forms of B. corium can be confused with Lilaceophlebia serpens (Tode: Fr.) Spirin & Zmitr., which usually di?ers in having a rather brightly colored hymenium with more or less expressed olive hues.
 
Description type:Non-original description 
Description:Byssomerulius corium (Pers.: Fr.) Parmasto, Eesti NSV Tead. Akad. Toimet. Biol. 16: 383, 1967. Fig. 1
= Thelephora corium Pers. : Fr. 1821. = Merulius corium (Pers.: Fr.) Fr. 1828. = Meruliopsis corium (Pers.: Fr.) Ginns 1976. = Merulius confluens Schwein.: Fr. 1822. = Merulius pallens Schwein. 1832, non Berk. 1841. = Merulius aurantiacus Klotzsch ex Berk. 1836, non (Wulfen: Fr.) J.F. Gmel. 1792. = Merulius haedinus Berk. & M.A. Curtis 1872. = Merulius sordidus Berk. & M.A. Curtis ex Cooke 1891. = Merulius pelliculosus Cooke 1891. = Phlebia deglubens Berk. & M.A. Curtis ex Cooke 1891. = Merulius deglubens (Berk. & M.A. Curtis ex Cooke) Burt 1917. = Phlebia sodiroi Pat. 1892. = Merulius sodiroi (Pat.) Rick 1960. = Merulius moelleri Bres. & Henn. 1896. = Merulius stereoides Henn. 1901. = Merulius ulmi Peck 1906. = Merulius hirsutus Burt 1917. = Merulius cubensis Burt 1917. = Merulius flavescens Bres. 1920. = Merulius ochraceus Lloyd 1921. = Merulius aurantius Lloyd 1922. = Cladoderris rickii Lloyd 1923. = Merulius chilensis Speg. 1924. = Merulius dubiosus Bres. ex Rick 1938.
Basidiocarps annual or persisting, resupinate - prostrate or pileate, 5-10 x 2-4 x 0.5-6 mm, usually confluent, papery, fragile when dry. Abhymenial surface tomentose to almost glabrous, obscurely zonate, white to grayish. Context white, suberose. Margin up to 3 mm wide, sterile, white, inrolled or adhered to the substrate. Hymenium 0.2-2 mm thick, folded (merulioid), creamish, yellowish, pale, reddish, or pale-ochraceous, with some grayish or violaceous tints in old basidiocarps, of ceraceous consistency.
Hyphal system pseudodimitic. Hyphae 2-6(8.5) µm in diam., simple septate or with rare double clamp-connections, thin- to slightly thick-walled, regularly branched at a sharp angle, sparsely encrusted. Cystidia none, but with basidioles having in some cases hyphoid or capitate apical proliferation. Basidia long-clavate, constricted, 17-40 x 4-6 µm, 4-spored, simple-septate at base. Spores ellipsoid-cylindrical, with suprahilar depression, in some cases, slightly curved, 4.5-9 x 2.3-4.5 µm, smooth, thin-walled, hyaline, usually with a central oil-drop, inamyloid, slightly cyanophilous when young.
Ecology, range, and distribution?Grows on dry, fallen branches and trunks of leafy trees. Produces a white rot. Found in Europe, Asia, Africa, Australia; North, Central, and South America. The species is widely distributed over the Northern Hemisphere, but distinctly more frequent in subarid areas. In the taiga forests B. corium prefers intra-zonal elements of the vegetation cover. The most typical substrate for the species is dry, attached elm branches, but the fungus occurs also on linden, oak, maple, willow, alder, rowan, birch, aspen, plus many subtropical trees and shrubs.
 
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