Public Description of Crinipellis malesiana Kerekes, Desjardin and Vikineswary

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Name: Crinipellis malesiana Kerekes, Desjardin and Vikineswary
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Marasmiaceae

General Description:

Crinipellis malesiana is characterized by the following combination of features: a dark brown pileus and brown robust stipe; simple, entire cheilocystidia; clavate to fusoid pleurocystidia; pileus hairs and stipe tissue that turn yellowish green in KOH; and elongate-ellipsoid basidiospores with Qmm = 2.2. The greening reaction of the tissues in KOH suggests that this species belongs in section Grisentinae.

Diagnostic Description:

Pileus 2–13 mm diam., convex and shallowly umbilicate or papillate when young, becoming broadly convex and papillate to umbonate with age, often with one or two raised concentric ridges surrounding central papilla, striate to sulcate, dull, dry, radially fibrillose-hairy to hispid, hairs extending beyond margin; brown overall when young, becoming dark brown (7F8) at the disc and brown to brownish orange at the margin in age. Context < 1 mm thick, pale brown to yellowish white. Lamellae adnexed to adnate, close to crowded with 3–4 series of lamellulae, yellowish white to white. Stipe 4–22 × 1–2 mm, central, cylindrical, thickened near base, dry, dull, fibrillose-hairy to hispid overall insititious, brown overall, slightly paler than the pileus. Rhizomorphs absent. Odor and taste none.

Basidiospores 8–12.5 × 4–6.5 μm [xmr = 11.1–11.4 × 4.9–5.2 μm, xmm = 11.3 ± 0.1 × 5.0 ± 0.2 μm, Q = 1.5–2.7, Qmr = 2.2–2.3, Qmm = 2.2 ± 0.1; n = 25 spores per 3 collections], phaseoliform in side view, oblong in frontal view, smooth, hyaline, inamyloid, thin- to thick-walled. Basidia none observed. Basidioles 15–34 × 5.5–8 μm, clavate to cylindrical with rounded to subacute apex. Pleurocystidia 30–50 × 5–9.5 μm, projecting up to 15 μm beyond basidioles, clavate to fusoid, hyaline, inamyloid, thick-walled, not refractive. Cheilocystidia abundant; main body (11–) 21–40 × 4–9 μm, clavate to broadly clavate or cylindrical, hyaline, inamyloid, thin- to thick-walled, majority entire, few with 1–3 apical appendages 1–3 μm long. Pileipellis a cutis of hyphae 5–6 μm diam., slightly inflated, hyaline to light brown, inamyloid to dextrinoid, slightly thick-walled, giving rise to terminal hairs with basal clamp connections. Hairs 175– 555 × 2.5–5 μm, cylindrical, apices mostly rounded, few with acute apices, with secondary septations, thick-walled (2–3 μm), weakly dextrinoid, becoming yellowish green to green in KOH. Pileus trama subregular; hyphae 2–8 μm diam., hyaline, inamyloid to weakly dextrinoid near cutis, slightly thick-walled. Lamellar trama subregular; hyphae 2–8 μm diam., hyaline, inamyloid, slightly thick-walled. Stipe tissue monomitic, parallel, tightly packed; stipitipellis composed of repent cortical hyphae, caulocystidia and terminal hairs; cortical hyphae 2.5–5 μm diam., cylindrical, thick- walled, dextrinoid, becoming light pea green in KOH; medullary hyphae 2–5 μm diam., cylindrical, thin-walled, inamyloid to weakly dextrinoid, hyaline; caulocystidia 22–45 × 5–8 μm, thick-walled cylindrical; terminal hairs 72–440 × 5–10 μm, cylindrical, apices narrowly rounded, thick-walled, inamyloid to weakly dextrinoid, hyaline to light brown in water, hyaline to light yellowish green in KOH. Clamp connections present.

Habitat: Scattered to gregarious on woody debris.

Known distribution: Indonesia and Malaysia, Thailand.

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