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 Add this item to the list   830303 Original description
Remarks (public):Holotype: TNS-F-70747 
Description type:Original description 
Description:Basidiomata small, collybioid. Pileus 10–50 mm diam, initially hemispherical to hemispheric-convex expanding to convex to planoconvex with a depressed to umbilicate center, not hygrophanous, not translucently striate, light orange to greyish red with a darker center, often with lilac to dark blue tinge near margin, entirely fibrillose or minutely squamulose, sometimes radially splitting with age. Lamellae subdistant, white or cream-color at first, then flesh coloured, edges serrulate and flocculose, concolorous or sometimes with dark blue tinge. Stipe 25–60 × 3–5 mm, almost cylindrical, sometimes slightly thickened at base, rarely somewhat twisted, pale orange or whitish to grey towards base, sometimes with slight blue-green tinge, smooth, almost polished, white tomentose at base. Context thin, concolorous with surface, odour and taste indistinct. Basidiospores 8‒11(–12) × 6.5–8 μm (n=50, mounted in water ), Q = 1.07–1.42, 6–9-angled in side view. Basidia 25–39 × 7–10 μm (excluding sterigmata), clavate, 4-spored, without clamp-connections. Lamella edge of serrulatum-type. Cheilocystidia 32–63 × 7–18 μm, clustered densely, cylindrical to subfusiform or sublageniform, sometimes septate, often with violaceus blue, granular intracellular pigment. Pleurocystidia absent. Pileipellis a trichoderm composed of hyphae 4-10 μm across with inflated terminal elements, 15–30 μm; intracellular pigments pink to brown with violet tinges. Stipitipellis a cutis of 4‒8 μm wide hyphae, made up of cylindrical hyphae with granular dark blue intracellular pigment, terminal cells often differentiated, clavate, particularly in apical part. Clamp-connections absent. Habitat and distribution: growing solitary, scattered or gregarious on the ground among leaf litter or grass. Known only from Japan. Notes: Entoloma nipponicum forms a distinct clade in our phylogram where it clusters in the serrulatum clade of subgenus Cyanula, together with species from Europe, China, and North America. It is characterized by a serrulatum-type, blue pigmented lamella edge. Distinctive characters of E. nipponicum are the rather light coloured fruiting bodies with predominantly yellow-orangey to greyish red pileus. As such it reminds of Entoloma catalaunicum from Europe, described with a pinkish-red pileus and blue stipe, which, however, comes in a distant phylogenetic position outside the serrulatum clade. Blue tinges, so eminent in the European E. serrulatum and E. querquedula, are almost lacking in E. nipponicum. Entoloma subcaesiocinctum from China has a browner coloured pileus and a fibrous stipe. Entoloma subserrulatum from North America has a more yellowish grey pileus, and a pallid, almost white stipe. 
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