Public Description of Hebeloma griseocanescens A.H. Sm., V.S. Evenson & Mitchel

Title: Public Description (Default)
Name: Hebeloma griseocanescens A.H. Sm., V.S. Evenson & Mitchel
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 Public Description (Default) [Edit]

Description status: Unreviewed

General Description:

Habit, habitat, and distribution.-Gregarious on wet earth, Independence Pass area, Pitkin County, Colorado, July 23, 1978 (type, MICH).

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Diagnostic Description:

Pileus 1-3.5 cm broad, obtuse to convex, becoming plane, sur- face viscid but soon dry, grayish hoary at first from a thin coating of veil fibrils, blackish brown beneath the canescence, cinnamon-brown in age. Context concolorous with the moist surface, odor none, taste mild; FeS04 staining stipe base olive-black.
Lamellae broad, close, adnate, at first grayish, in age ± “Verona Brown,” edges stained darker in age but not beaded (and stains not resulting from dried droplets).
Stipe 2-3.5 cm long, 1.5-3 mm thick, equal, tubular, cortex dull brown; surface reddish brown and decorated with a thin coating of grayish fibrils, soon dark brown overall to (finally) blackish and with only faint traces of the veil.
Spores 8-10 (11) x 5-6 fJ-m, yellowish in KOH, nearly hyaline revived in Melzer’s (not dextrinoid), faintly marbled, mostly oblong to ellipsoid, in profile view a very small number obscurely inequilateral.
Hymenium.-Basidia 4-spored, 7-8 fJ-m broad. Pleurocystidia ab- sent. Cheilocystidia versiform: utriform and 18-26 × 8-11 fJ-m, clavate and 18-27 × 8-15 fJ-m, elongate-fusoid-ventricose and 36-40 × 8-11 × 4-6 fJ-m, and finally some elongate-clavate and ± 50 × 6-8 fJ-m. Lamellar and pilear tissues.-Lamellar trama typical for the ge- nus. Cuticle of pileus an ixocutis fairly well developed, the hyphae 2.5-4 fJ-m diam, walls refractive (gelatinized), clamps present. Hypo- dermium intermediate in type (a mixture of hyphal segments and cells) walls of the elements heavily encrusted and rusty ochraceous in KOH, redder brown in Melzer’s. Tramal hyphae typical for the genus but with a tendency toward having encrusted walls especially near the hypodermium.


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