Public Description of Tylopilus rubrobrunneus Mazzer & A.H. Sm.

Title: Public Description
Name: Tylopilus rubrobrunneus Mazzer & A.H. Sm.
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Description status: Unreviewed

Diagnostic Description:

Pileus convex at first and usually remaining so at maturity, occasionally becoming plane to somewhat undulate, with a very soft texture resembling that of kid gloves, dark violaceous at first but fading at maturity to violaceous-tan or pinkish brown, glabrous or with a few minute scales, subviscid when wet, with a minute sterile margin, 60-250 mm in diameter. Stipe nearly white to yellow-buff at first, becoming brownish at maturity, with olivaceous stains, glabrous, smooth to faintly reticulate at apex or occasionally coarsely reticulate, clavate, 60-150 × 17-50 mm. Tubes adnate at first and then adnexed, nearly white at first but quickly becoming pinkish- to violaceous-brown, pinkish at maturity, staining brown when bruised, with mouths about 1.6-1.7/mm at maturity. Flesh of pileus white, olivaceous where tunneled by insects, extremely bitter, odourless. Flesh of stipe white.
Pileus cuticle composed of an upright turf of cylindrical to ventricose cells measuring 13-30 × 3.4-8.8 µm, arising from a very loose tissue below, sometimes with elements appearing to be encrusted (at least below). Pileus context composed of hyaline, clampless, interwoven hyphae 2-12 µm in diameter. Hymenophoral trama bilateral, composed of hyaline clampless hyphae 2-12 µm in diameter. Lactifers abundant in the pileus context and hymenophoral trama. Pleurocystidia abundant, mostly ventricose-rostrate, not clamped at base, 40-53 × 6.5-16 × 2.0-4.0 µm. Cheilocystidia abundant and forming a sterile layer, cylindrical to clavate or rarely ventricose-rostrate, not clamped at base, 20-43 × 2.5-8.0 × 2.5-3.0 µ. Basidia clavate, 4-spored, not clamped at base, 20-37 × 6.5-10.0 µm. Basidiospores elongate-virguliform in side view, elongate-elliptical in front view, smooth, without germ pores, weakly dextrinoid and cyanophilous (at least some spores), very pale yellowish or pinkish as viewed under oil immersion, dull pink in mass, 9.8-13.8 × 3.0-4.2 µm.
Substrate: In soil under Fagus grandifolia and Acer saccharum.
Distribution: Quebec.

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Description author: Excited delirium [EXD]▼ (Request Authorship Credit)