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 Add this item to the list  833552 Original description
Description type:Original description 
Description:Basidiomata small to medium sized, collybioid. Pileus 10-40 (–50) mm, initially hemispherical, convex, becoming plane at maturity, apricot (47; Royal Botanic Garden Edinburgh 1969), sometimes paler orange (48) margin, and darker sienna (11) centre, dry, smooth to finely matt, margin entire, not in-rolled. Pileus colours display much variation depending on weather, tending to wash out in rain, and increase in intensity in dry weather. Flesh thin, white. Lamellae white, margins white or concolorous with pileus, free to adnexed, close, 18-22, 3-4 mm deep, with 2-3 series of lamellulae, very fine shallow cross-anastomoses, mostly in outer half of cap, and not always present in juveniles. Stipe central, cartilaginous, 30-55 × 3-5 mm, white to cream full length of stipe, or occasionally yellowish-brown lower half, smooth, hollow, cylindrical, sometimes bi-tubular; basal hyphae forming a white tuft. Spore print white. Basidiospores variable between collections, with holotype at lower end of range, (8.5-)9-10.5(-11.5) × (4.8-)5-6(-6.8) μm (av. 10 × 5.5 μm, Q = 1.47-2.04, Qm = 1.76 ± 0.13, n = 50, s = 5 specimens), slightly curved ellipsoid to elongate, hyaline, inamyloid, with some granular contents. Basidia 22-30 x 8-9.5 μm, sterigmata short, rounded, 2-2.5 μm, 2-4 spored. Basidioles 22-23 × 5-8 μm, clavate. Cheilocystidia common, Siccus-type broom cells, with short to very long apical divergent projections, main body 9-20 × 4-11 μm, digits 4-12 × 1-2 μm, with 2-4 (-8) digits, mostly thin walled, with body also thin-walled except for outer ¼ at base of projections; narrowly to broadly and irregularly cylindric, clavate, occasionally branched; rare smooth, mucronate cheilocystidia also found, 24 × 8 μm. Pleurocystidia absent. Pileipellis consists of a hymeniderm of Siccus-type broom cells, main body 6-19 (-27) × 3.5-10.5 μm, digits 2.5-11.5 × 1-2 μm, broadly clavate, cylindric, ± branching with sparse to common digits, usually thin walled at base, often thick walled and refractive in upper two-thirds, and including the digits, which may be bifid; pileal hyphae 2.5-7 μm. Caulocystidia absent. Stipitipellis of parallel hyphae, 4.5-10 μm diam. Clamp connections present in all tissues. Melzer’s reaction - pileal and lamellar trama inamyloid, stipe trama mildly dextrinoid. 
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