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 Add this item to the list   818066 Original description
Description type:Original description 
Description:Basidiocarps small to medium-sized, slenderly tricholomatoid. Pileus 8–38 mm diam., somewhat conical with a prominent obtuse umbo when very young, becoming somewhat campanulate or conico-convex with a mammillate or broad umbo and finally plano-convex or upturned with a slight depression around the umbo; surface dark brown (5F7, 5F8/OAC733) on the umbo and on the striations, yellowish brown (5D4, 5D5/OAC728) elsewhere, rather hygrophanous and becoming slightly paler, finely pellucid-striate, glabrous to the naked eye, finely appressed fibrillose all over under a lens; margin initially incurved, becoming decurved or reflexed with age, crenate or somewhat wavy, slightly fissile with age. Lamellae sinuate or emarginate or rarely emarginate with a small decurrent tooth, subclose, pale yellow (4A2/OAC900) or yellowish gray (4B2/OAC893) when very young, becoming orange white (5A2, 6A2/OAC759) or pale orange (6A3/OAC695) with age, up to 6 mm wide, with lamellulae in 2-3 tiers; edge entire to the naked eye, finely torn or crenate under a lens, concolorous with the sides. Stipe 22–104 × 2–6 mm, central, terete, equal or slightly tapering towards the apex, cartilaginous, hollow; surface grayish yellow (4B3/OAC829) when young, becoming grayish brown (5C3, 5C4/OAC745) or brownish gray (5D2, 5D3/OAC739), fibrillose-striate all over; base with fine, white, mycelial cords. Odor and taste not distinctive.
Basidiospores 9–13 × 8–11 (11.1±0.96 × 9.46±0.81) µm, Q = 1–1.3, Qm = 1.17, quadrate or pentagonal, subisodiametric to heterodiametric, hyaline, slightly thick-walled. Basidia 23–49 × 8–15 µm, clavate, hyaline, thin-walled, 4-spored; sterigmata up to 4 µm long. Lamella-edge sterile or occasionally heterogeneous. Cheilocystidia 23–54 × 6–15 µm, narrowly clavate, cylindrical or cylindrical with a median constriction, hyaline, thin-walled. Pleurocystidia none. Lamellar trama subregular, made up of both narrow and slightly inflated hyphae; hyphae 6–24 µm wide, with a pale brownish yellow intraparietal pigment and occasionally with faint brown encrustations, thin- to slightly thick-walled. Subhymenium inconspicuous. Pileitrama subregular, with both narrow and inflated hyphae as well as a few oleiferous hyphae; hyphae 6–33 µm wide, pale yellow, thin-walled. Pileipellis a cutis rarely disrupted by isolated erect hyphae; hyphae 6–17.5 µm wide, with a pale brownish yellowish intraparietal pigment and occasionally with faint brown encrustations, thin- to slightly thick-walled. Stipitipellis a cutis; hyphae 3–11 µm wide, with a pale yellow or pale brownish yellow intraparietal pigment and faint brown encrustations, thin-walled. Caulocystidia absent. Clamp-connections observed on all hyphae.
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