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 Add this item to the list  822676 Original description
   
Remarks (public):Entoloma nigrovelutinum is remarkable species with bluish black basidiomata characterized by a trichoderm structure of the pileipellis and absence of clamp-connections. The structure of pileipellis makes it superficially similar to species of the subgenus Trichopilus. Due to the stipitipellis structure it also has resemblance to some Leptonia species. But absence of clamp-connections and form of the cheilocystidia lead to the thought that this species belongs to the subgenus Cyanula. The position of the species within Cyanula-clade have been confirmed by the molecular analysis. 
Description type:Original description 
Description:Basidiomata medium-sized, collybioid to tricholomatoid. Pileus 15‒40 mm diam,, initially hemispherical to convex, becoming applanate with or without central depression, with involute margin, not hygrophanous, not translucently striate, blackish blue to dark violet (18F6–8, 19F6-8; Kornerup & Wanscher 1978), entirely uniformly velvety. Lamellae moderately distant, adnexed, adnate-emarginate or adnate with small decurrent tooth, bluish grey (19B2–3), becoming greyish-pink, with dark blackish blue serrulate edge. Stipe 30–70 × 4–6 mm, cylindrical, broadened or tapering towards the base, longitudinally striate, covered with blackish blue (19F6–8) squamules on a whitish background, with white apex, white tomentose at base. Context white, bluish under the pileus surface. Smell faint, taste not reported. Spores (8.6)–9.4–(10.6) × (6)–6.5–(7) μm, Q=(1.4)–1.5–(1.6), heterodiametrical, with 5–6 angles in side-view. Basidia 36–40.6 × 9.7–10.5 μm, 1–4- spored, narrowly clavate to clavate, clampless. Cheilocystidia 35–65 × 5.5–10.5 μm, forming a sterile edge, cylindrical, lageniform or fusiform, sometimes septate with dark intracellular pigment. Pileipellis a well differentiated trichoderm of cylindrical to slightly inflated or fusiform hyphae 10–20 μm wide with swollen terminal elements and bluish-violaceous intracellular pigment, brownish in KOH. Caulocystidia as cylindrical hairs 40–120 × 6–10 μm. Clamp connections absent. Habit, habitat and known distribution. — In small groups on soil in tropical montane evergreen mixed forests. Known from Vietnam. 
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