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Page number:879 
Remarks (internal):Entoloma singulare belongs to stirps Lividoalbum on account of the robust stature, opaque pileus and intracellular pigment in the pileipellis. Its tough context and habit reminds of a Lyophyllum species. The reddish-violaceous colours observed in the pileus and stipe base are distinctive. Entoloma griseoluridum certainly is close, but differs in darker colours in the whole fruit body, and lack of violaceous-bluish tinges in the base of the stipe. 
Description type:Non-original description 
Description:Entoloma singulare (Romagn.) Bon & Courtec. in Doc. Mycol. 18 (69): 38. 1987. (fig. 299)
Rhodophyllus singularis Romagn. in Bull. Soc. Linn. Lyon, no. spéc.: 386. 1974.
Pileus up to 60 mm, flattened conical to convex with strongly involute margin, expanding to planoconvex with age, hygrophanous, not translucently striate, dark brown to umber brown, not very much pallescent on drying, sometimes with water-spots in marginal zone, at centre minutely silvery pruinose-aeriferous, rest glabrous, shining. Lamellae moderately distant, adnate-emarginate, segmentiform, sordid ochre to greyish beige or with very slight olivaceous tinge, with entire, concolourous edge. Stipe 40-65 x 7-10 mm (apex), downwards broadening into clavate base, strongly white-silvery fibrous on pale brown to isabella background, sometimes with violaceous-reddish spots, apex white flocculose. Context rather compact and rigid, brown in cortex of stipe, in base of stipe sometimes with bluish tinges.
Spores 8.5-11 x 7.0-9.0 µm, Q = 1.2-1.5, heterodiametrical, 5-7 angled in side-view. Basidia 25-40 x 7-12 µm, 4-spored, clamped. Lamella edge fertile. Cystidia absent. Hymenophoral trama regular, made up of inflated elements, 40-110 x 12-24 µm. Pileipellis a cutis or thin ixocutis of cylindrical, 2-5 µm wide hyphae. Subpellis poorly developed, made up of inflated elements, 15-50 x 5-15 µm, gradually passing into pileitrama. Pigment brown, intracellular in upper layer of pileus. Clamp-connections present.
Habitat and distribution: terrestrial in mixed forest of Quercus and Carpinus on loamy, calcareous soil. So far known from France and Germany.
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