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Literature:
 
Page number:923 
Remarks (internal):The dark, distinctly umbilicate to infundibuliform pileus and rooting stipe are distinctive for this species. It reminds of Entoloma costatum, but that species differs microscopically by the isodiametrical spores and clampless hyphae. The species in sect. Polita usually have a smaller habit, and a polished or substriate stipe. 
Description type:Non-original description 
Description:Entoloma turbidatum Britzelm., Hymenomyceten Südbayern 5: 8. 1891. (fig. 317)
Pileus 40-60 mm, initially convex with umbo, soon expanding and becoming umbilicate to infundibuliform with involute margin, hygrophanous, not translucently striate, dark brownish black at first, finally ochraceous-grey, not pallescent along radial streaks. Lamellae adnate-decurrent, arcuate to segmentiform, thickish, sordid pink with concolourous edge. Stipe 60-90 x 8-10 mm, broader towards apex, tapering towards base, ending in a rooting point, dark grey at first, then sordid ochraceous-white, innately fibrillose lengthwise; becoming fistulose. Context white. Smell and taste farinaceous.
Spores (7.5-) 8.0-11.0 x (6.5-) 7.0-8.5 µm, Q = 1.15-1.4 (-1.5), Qav = 1.25, subisodiametrical to heterodiametrical, 6-8 angled with pronounced angles in side view. Basidia 27-45 x 10-12 µm, 4-, rarely also 2-spored, clamped. Lamella edge fertile. Cystidia absent. Hymenophoral trama regular, made up of relatively long, cylindrical elements. Pileipellis a cutis of cylindrical hyphae, 2-8 µm wide. Pigment brown, intracellular. Clamp-connections present.
Habitat and distribution: terrestrial in mixed wood of Populus and other deciduous trees. So far only known from Germany.
 
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