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Page number:535 
Remarks (internal):H. sibiricum is distinguished from 11. cremeoalbum, which is its closest relative, in having considerably smaller spores and basidia. There is a variation in the spore size and in some specimens single spores reaching 10 or 11 µm in length can be found, but on the whole it is rather homogeneous. One specimen (Eriksson & Kujala 10178) deviates in showing an amyloid reaction in the basidial wall but in other respects it matches the species well. A few specimens are strikingly yellow in the herbarium without differing in other respects, as far as we can see.
In accordance with specimens determined by Litschauer in herb. Romell, Eriksson (1958) named this species H. teutoburgense (Brinkm.) Erikss. Jülich has, however, shown (Persoonia 7:3 p. 383, 1973) that the type specimen of Corticium teutoburgense is a species of Athelia. Consequently, it is necessary to find a new name for it. The type of Radulomyces sibiricus agrees perfectly with our species.
Description type:Non-original description 
Description:Hyphoderma sibiricum (Parm.) Erikss. & Strid comb. nov. - Radulomyces sibiricus Pam., Consp. syst. Cort. p. 223, 1968.
Fruitbody resupinate, effused, at first as small irregular patches, then confluent, smooth, thin (0,05-0,1 mm), white when alive, mostly cream-coloured or rarely yellow in the herbarium, margin normally not differentiated or sometimes very finely fibrillose (lens 50 x).
Hyphal system monomitic; hyphae thin-walled, 2-3 µm wide, richly branched, with clamps at all septa; texture dense in the subhymenium, looser next to the substrate. Cystidia none, but between the basidia paraphysoid hyphal ends, not projecting above the basidia. Basidia subclavate to almost cylmdrical, slightly constricted or somewhat sinuous, with plenty of oildrops in the protoplasm, 25-35 (-40) x 5-7 µm, normally 4 sterigmata Basidia in rare cases amyloid, normally non-amyloid. Spores ellipsoid, adaxial side straight or slightly convex, thin-walled, smooth, non-amyloid, with numerous oildrops in the protoplasm, mostly 7-9x4- 5 µm.
Habitat and distribution. On conifer wood, generally of Picea abies in Hylocomium-Vaccinium myrtillus biotopes. It seems to belong to the boreocontinental element of species which mainly are found in Northeastern Scandinavia and Finland but also in the inner part of S. Sweden. Little is known about its occurrence in Norway (found in Oppdal and Nordland), but it is probably distributed in the continental conifer forests in E. and N. Norway.
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