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Page number:1069 
Remarks (internal):Entoloma viaregale is a rather rare species, which seems to have a predominantly boreal distribution, since it is known from a few localities in Scandinavia, the Baltic countries and France. An emended description is given here, based on additional collections obtained. Entoloma viaregale belongs to stirps Anatinum on account of the brown, finely tomentose-subsquamulose, opaque pileus, blue-grey, non-polished stipe. Within this group it is distinguished by the pruinose rather than fibrillose-striate stipe, fertile lamella edge and moderately sized spores. Entoloma anatinum differs by a more conical, coarsely squamulose pileus, coarsely fibrillose striate stipe, and slightly larger spores. 
Description type:Non-original description 
Description:Entoloma viaregale Noordel. in Persoonia 12: 211. 1984.
Icon.: Eyssartier et al., Bull. Soc. mycol. Fr. 115: 173-175, figs. 26-28, pl. V. 1999.
Pileus 10-30 mm broad, conical or campanulate at first, then hemispherical, with slightly depressed centre, with involute then deflexed margin, not hygrophanous, not translucently striate, rather uniformly dark grey-brown to blackish brown, without any trace of blue, not or only slightly paler at margin, tomentose then minutely squamulose all over (lens). Lamellae, L = 20-30, l = 1-3 (-5), normally crowded, broadly adnate-emarginate, segmentiform to ventricose, up to 4 mm broad, white or sordid greyish-creamy white, then pink with distinct grey tinge, with entire to serrulate, concolourous edge. Stipe 20-70 x 1.5-4 mm, cylindrical, slightly swollen at base or compressed with longitudinal groove, fistulose, dark blue, concolourous with pileus at first, then somewhat paler and mixed with brown, very finely pruinose subtomentose and finely striate all over, base with white tomentum. Context pale blue. Smell and taste disagreeable, rancid-farinaceous, sometimes weak or lacking.
Spores (9.0-) 10-13 x 7.0-8.5 ?m, average 10.5 x 7.6 ?m, Q = 1.2-1.4-1.7, irregularly 5-7 angled in side-view with thickened walls. Basidia 22-40 x 5.0-10 ?m, 4-spored, clampless. Lamella edge fertile, cystidia absent. Hymenophoral trama of cylindrical elements, 4.0-9.0 ?m wide. Pileipellis a cutis of cylindrical to slightly inflated hyphae, 3.0-10 ?m wide with trichodermal tufts of clavate to subglobose terminal elements, 20-70 x 7.0-25 ?m, forming the squamules on pileus. Pigment brownish-blue, intracellular. Pileitrama regular, made up of cylindrical hyphae, 3.0-15 ?m wide, with few, not abundant brilliant granules. Stipitipellis a cutis of cylindrical hyphae, 2.0-7.0 ?m wide with bundles of patent, cylindrical caulocystidia, 20-70 x 2.0-6.0 ?m with thin, colourless walls. Clamp-connections absent.
Habitat and distribution: in roadsides along forest road and in open spots in forest (Picea, Pinus, Betula, Ulmus glabra, Fraxinus excelsior, Quercus, and Juniperus communis, preferably on richer, slightly calcareous soil. Rare, but widely distributed in the Nordic countries and France.
Collections examined: À…land Islands, Jomala Parish, Prästg?rden, Ramsholmen, 3 Sept. 1993, Jukka Vauras 8554F (L, TUR). - Finland, Varsinais Suomi, Nauvo Parish, Berghamn, Boskär, Lönöholmen, 24 Aug. 1993, Jukka Vauras 8223F (L, TUR).
 
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