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Page number:731 
Remarks (public):H. vellereum is easily recognized from the other species of the genus in lacking cystidia, having globose, not quite smooth spores, a reddish fruitbody (at last in vivo) and usually many chlamydospores. Further, it differs in the shape of the basidia, which are tubular, remarkably long with a tapering base and comparatively short sterigmata. The spores may in optical sections under the microscope look echinulate, but the SEMs show that the surface is irregularly uneven, and is difficult to interpret. We have not found such a sporesculpture in any other fungus. The difference is not so great however, that there should be any reason to question its affinity to the genus. 
Description type:Non-original description 
Description:Hypochnicium vellereum (Ell. & Crag.) Parm., Consp. syst. cort. p. 116, 1968 - Corticium vellereum Ell. & Crag., Bull. Washburn Coll. Lab. Nat. Hist. 1 p. 66, 1885.
Fruitbody resupinate, adnate, effused, membranaceous, ab. 0,1-0,2 mm thick, whitish with a rose tint to rose red, in the herbarium fading to yellowish or pale ochraceous; hymenium continuous, smooth or somewhat pulverulent; margin in young specimens fibrillose, in mature ones often fertile throughout.
Hyphal system monomitic; hyphae 3-5 µm wide, with thin or somewhat thickened walls, fibulate; subiculum of densely interwoven hyphae with predominantly vertical hyphal direction.
Cystidia none.
Basidia tubular, somewhat sinuous, tapering towards the base, 40-60 x 5-6 µm, with 4 small sterigmata and with basal clamp; protoplasm grainy with oildrops.
Spores globose, thickwalled, irregularly uneven, cyanophilous, non-amyloid, usually uniguttulate, mostly 7-8 µm in diam.
Conidia (chlamydospores) usually present, often in large quantities, formed apically or intercalary on thinwalled hyphae, ab. 2 µm wide; apical conidia rounded or pearshaped, intercalary ones more or less fusiform; conidial wall much thickened, strongly cyanophilous and also dextrinoid; protoplasm mostly with one oildrop, size of conidia 8- 10 x 6-8 µm.
Habitat. On deciduous wood (e.g. Ulmus) in fertile, humid, herb-rich forests on mould soil. Fruitbodies start late in the season and are best developed during mild winters when they can be collected in January. It grows usually near the ground but when weather is mild and humid, fruitbodies can be found on trunks, several meters above the ground. Fig. 363 shows a very rich occurrence of H. vellereum on trunks of Ulmus in a brook valley (Lyseg˴rden near Goteborg).
Distribution. A rare species, collected sometimes in Sweden from Uppland and southwards, and a few times in Denmark. Besides A. Strid reports two finds on the East coast of N. Sweden.
 
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