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Remarks (public):Entoloma aurorae-borealis belongs to the Rhodopolia clade of the genus Entoloma (subgen. Entoloma). It is morphologically characterized by the somewhat rimose-rugulose surface of the pileus and presence of abundant cheilocystidia. Furthermore, the alpine habitat amongst Salix herbacea appears to be characterizing. 
Description type:Original description 
Description:Pileus 30–60 mm broad, convex-umbonate at first then expanded with straight margin, with low, rounded umbo, sometimes within a shallow depression, probably not distinctly hygrophanous, reddish brown to very dark brown or almost black at centre, distinctly paler towards margin, sub glabrous to slightly rimose in marginal zone, somewhat rugulose at centre, sometimes radially splitting with age, translucently striate up to half the centre. Lamellae emarginate, subsegmentiform, L = up to 40, l = 3–7, white, only late with slight pink tinge. Stipe 25–75 × 4–12 mm, cylindrical or gradually broadened towards apex and base, greyish brown, colour more or less the same as margin of pileus, with scattered white fibrils lengthwise, not polished, broadened, occasionally somewhat scurfy towards apex. Smell none. Taste not noted. Spores 9.0–10.5 × 6.0–9.0 μm, Q = 1.1–1.4, subisodiametrical to heterodiametrical, Qav = 1.2, 5–7 angled in side view with rather pronounced angles. Basidia 22–30 × 6.0–9.0 μm, 2- and 4-spored. Lamella edge heterogeneous; cheilocystidia very abundant, in clusters among the basidia, 20–42 × 5.0–12 μm, versiform or (irregularly) clavate to lageniform or utriform, thin-walled. Hymenophoral trama more or less regular, made up of relatively short elements, 40–120 × 5–11 μm. Pileipellis a cutis with transitions to a trichoderm, made up of cylindrical hyphae, 4.0–12 μm wide, with cylindrical to subclavate terminal elements, up to 15 μm wide, with intracellular and minutely incrusting pigment. Caulocystidia scattered at apex of stipe, similar to cheilocystidia. Clamps present in all tissues. Habitat: Entoloma aurorae-borealis is recorded four times among stones in a groove, sloping approximately across a north-south axis, in an alpine area (altitude between 540 and almost 700 meters) with different levels of calcareous soil, partly sandy. The finds were done in snow-bed vegetation with bryophytes, Salix herbacea, Oxyria sp. and Athyrium distentifolium. 
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