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Page number:934 
Remarks (internal):Entoloma olivaceohebes, is, as the name indicates, similar to E. hebes, from which it mainly differs by the prominent olivaceous tinges, not entirely sterile lamellae edge with scattered cheilocystidia, but above all by the different spore shape, varying from subheterodiametrical to isodiametrical. Entoloma malenconii, recently described from Spain from a similar habitat, differs mainly by the lack of olivaceous tinge, a hardly hygrophanous pileus, and strong rancid smell, but is otherwise very similar. Future observations on the variability of these taxa must prove whether they are really distinct. 
Description type:Non-original description 
Description:Entoloma olivaceohebes Hauskn. & Noordel. in Boll. Gr. Micol. G. Bres., n.s. 43 (3): 23. 2000. (fig. 320)
Icon.: Hausknecht & Reinwald in Natur und Mensch 2002: 25. 2002.
Pileus 15-28 mm broad, conical with acute or blunt umbo, hygrophanous, translucently striate, when moist grey-brown with distinct olivaceous tinge (K&W 6C3, 6DE4, but with olivaceous tinge), when old brown-yellow or red-brown with olivaceous tinge; glabrous to slightly rugulose. Lamellae straight adnate, ventricose, grey-olivaceous when young then grey-beige with pinkish grey tinge, with slightly flocculose, concolourous edge. Stipe 40-55 x 2-4 mm, cylindrical, grey-olivaceous when young, then greyish beige with slightly smoke-grey olivaceous tone, rather uniformly coloured, very slightly striate lengthwise, almost glabrous. Context grey-olivaceous. Smell and taste indistinct.
Spores (8.5-) 9.0-11.5 ?m, in average 10.1-10.4 x 7.4-7.7 ?m, Q = 1.0-1.3, Qav = 1.1-1.2, isodiametrical to subheterodiametrical with 5-7 angles. Basidia 20-29 x 6.0-9.0 ?m, 4-spored, clavate, clamped. Lamella edge heterogeneous, almost sterile. Cheilocystidia 20-60 x 3.0-7.0 ?m, subcylindrical, sometimes weakly capitate, scattered among basidia. Hymenophoral trama regular, made up of long, fusiform elements, 50-230 x 4.0-11 ?m, sometimes with finely incrusted walls. Pileipellis a poorly differentiated cutis of narrow, cylindrical, 2.0-4.0 ?m wide hyphae with coarsely incrusted walls, gradually passing into pileitrama. Pileitrama regular, made up of long, fusiform elements, up to 300 x 5.0-15 ?m. Clamp-connections present in hymenium and covering layer of pileus.
Habitat and distribution: in Mediterranean Cistus vegetation (C. monpeliensis and C. salviaefolius) on calcareous soil. So far only known from a few places in S. Italy (prov. Foggia).
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