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Page number:629 
Remarks (public):Close to H. subalutacea from which it differs in the thinner, greyish white fruitbodies and the broader and shorter spores. From very young specimens of H. subalutacea the spore shape seems to be the only reliable distinguishing character. H. altaica (fig. 301) is very close. It agrees in spore shape, which, however, may be a little smaller. The fruitbody of the type specimen is much thicker than in H. cineracea and is thus more similar to H. subalutacea.
From available material it is very difficult to decide whether H. altaica should be looked upon as a different taxon or not.
Description type:Non-original description 
Description:Hyphodontia cineracea (Bourd. & Galz.), John Erikss. & Hjortst. n. comb., Peniophora glebulosa Bres. ssp. cineracea Bourd. & Galz., Bull. Soc. mycol. Fr. 28 p. 387, 1912.
Fruitbody resupinate, effuse, adnate, small, thin, whitish to greyish white, under the lens porose and pilose by the projecting cystidia; hymenophore smooth or under the lens finely flocculose; margin indeterminate, in the periphery pruinose.
Hyphal system monomitic; hyphae thinwalled, 2-3 µm wide, somewhat cyanophilous, with clamps and frequently branched into a loose texture.
Cystidia numerous, 80-120 µm long or sometimes more, 6-7 µm wide, strongly projecting, thickwalled except in the apical part, some cystidia with secondary septa without clamps; distinctly cyanophilous.
Basidia at first clavate, then subcylindrical, slightly constricted or sinuous, 14-20 x 4-5 µm, with normally 4 sterigmata and with basal clamp.
Spores cylindrical, allantoid, generally somewhat curved, thinwalled, smooth, 5,5-6,5(-7) x 2-2,5(-3) µm, with oildrops or grainy oily contents in the protoplasm.
Habitat. On decayed wood, preferably of conifers (Pinus, Picea, Juniperus), sometimes also on deciduous wood. Originally described on Erica arborea in France.
Distribution. Rather little known species. Hjortstam (1973 p. 113) reports it as H. alutacea var. He and K.H. Larsson have collected it several times in VästergÀµtland and Dalsland in Sweden and they are of the opinion that it is rather frequent species, at least in this area. In Sweden it has otherwise been found twice in Smaland (S. Lundell, Eriksson). Revision of the herbarium material of H. subalutacea might give more localities.
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