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 Add this item to the list  815292 Original description
   
Description type:Original description 
Description:Diagnosis: Pileus 40–90 mm, surface rather dull, when moist for a long time viscid, colour dirty white on the margin, towards centre more and more darker, from brown orange, light orange to tawny or orange grey, brown orange to brown grey, lamellae closely set, with lamellulae, forked, whitish, stipe usually cylindrical, flesh firm, whitish, damaged slowly reddening, then slowly blackening, taste especially in lamellae first a bit acrid to acrid and long persistent; spores white, 7–11.2 × 5.5–7.7 µm, widely ellipsoid to oblong, nearly cylindrical, mean Qav from 1.39–1.8, with ornamentation up to 0.8(–1) µm high, partly, rarely fully reticular connected; dermatocystidia rather rare, one-celled. Holotype on more rich soil in mixed forest with Carpinus, Fagus, Picea, Pinus and Quercus. Characters: Pileus: 40–90 mm wide, convex when young, later expanded with deepened centre and incurved also wavy margin, surface smooth, when moist for a long time viscid, otherwise rather dull, marginal zone usually not striate or rarely very briefly striate; pileus colour in marginal zone dirty white, towards centre more and more darker, from brown orange (5C3), light orange (5D4) to tawny (5D–E5), or orange grey (5B2), brown orange (5C3–5) to brown grey (5C2) even after the white marginal zone; cutis hardly separable. Lamellae: white, dirty white, a bit cream, closely set, forked, lamellulae present. Stipe: approx. 30-60 × 10-25 mm, usually cylindrical, but also thickened against the base, white, the lower half often grey brown, surface reddening when touched, then slowly blackening. Flesh: firm, but not as hard as in other Compactae, whitish, damaged slowly reddening, then slowly blackening; smell slightly fruity; taste especially in lamellae first a bit acrid to acrid and long persistent. Macrochemical reactions: FeSO4 slowly dirty pink, Guajak rapidly and intensively dark blue green, Phenol relatively quickly brown. Exsiccate: strongly darkened, the whitish marginal zone of pileus brown, towards centre progressively darker, namely brown grey to almost black, the lamellae grey, partly grey brown and the stipes also dark brown, except at apex, which re-mained strictly white. Colour of spore print: I a (ROMAGNESI code). Spores: 7–11.2 × 5.5–7.7, mean 9.1 × 6.6 µm, Qav 1.38, average volume 207 µm3, widely ellipsoid to oblong, nearly cylindrical, e.g. 7.7 × 5.3 µm, 8.7 × 5.5 µm, 9.0 × 6.5 µm or 11.0 × 6.1 µm. In such cases those spores sometimes showing a suprahilar-depression with prolonged apiculus and a quotient up to 1.8. Ornamentation up to 0.8(–1) µm high, composed of warts and spines, rarely isolated, usually with ridges and lines or fine stolons, partly, rarely fully reticular connected. Suprahilar plage inamyloid in MELZER´s reagent. Basidia: 45–53 × 8–12 µm, clavate-fusiform, 4-spored. Hymenial cystidia: approx. 45–70 × 4–6 µm, thin, cylindrical, mostly with constricted appendages. Pileipellis hairs: 2.5–9 µm, septate in different length and sections often long, filamentose, cylindrical, also with outgrowths, usually tapering apically. Hyphae of the lower layers sometimes also shorter septate with bulbous sections. Dermatocystidia: 2.5–6 µm wide, rather rare, weakly reacting with am-monious congo red, one-celled, cylindrical, slightly thickened at most in the middle, also with outgrowths, apically with one or more constricted process(-es). 
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