Public Description of Crinipellis tabtim Kerekes, Desjardin & Lumyong

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Name: Crinipellis tabtim Kerekes, Desjardin & Lumyong
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Description status: Unreviewed

Taxonomic Classification:

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

General Description:

Notes: Diagnostic features of Crinipellis tabtim include: a bright burgundy to violet brown or dark ruby-colored pileus with a brown to reddish brown stipe; pileus hairs that turn slate blue in KOH with time; pileipellis cells and hairs with burgundy-colored incrustations when mounted in water; and cheilocystidia with numerous finger-like projections up to 13 μm in length. The slate blue reaction of the pileus hairs in KOH suggests that this species belongs in section Iopodinae subsection Iopodinae.

Diagnostic Description:

Pileus 1–11 mm diam., when young hemispherical to convex with inrolled margin, shallowly umbilicate, becoming plano-convex with concentric ridges around the umbilicus in age, dull, dry, radially appressed-fibrillose; disc dark violet brown to dark ruby (10–12F7), margin violet brown to ruby (10D–E4), fading to almost cream-coloured at the margin in age. Context < 1 mm thick, white, unchanging. Lamellae narrowly adnexed to free, close with 2–3 series of lamellulae, white. Stipe 15–30 × < 1 mm, central, terete, cylindrical, equal above, subbulbous at base, longitudinally striate, twisted-fibrous, insititious, dull, dry, fibrillose to hirsute; reddish brown (9E5) to light brown (6D7). Rhizomorphs No obvious rhizomorphs, however, some collections with the presence of a white mycelial pad on the leaves. Odor and taste none.

Basidiospores 8–11 × 4–5.5 μm [xmr = 9.1–9.3 × 4.0–4.1 μm, xmm = 9.2 ± 0.1 × 4.1 ± 0.1 μm, Q = 1.8–2.8, Qmr = 2.2–2.3, Qmm = 2.3 ± 0.9; n = 25 spores per 4 collections], lacrymoid to elongate ellipsoid, smooth, hyaline, inamyloid, thin-walled. Basidia clavate, 4-spored, hyaline, inamyloid, thin- walled. Basidioles clavate with rounded to subacute apex. Pleurocystidia, absent. Cheilocystidia common; main body 10–20 × 5– 9 μm, clavate, hyaline, inamyloid, thin-walled, with 3–12 finger-like apical appendages; apical appendages 1–13 μm long, hyaline, inamyloid, thin-walled. Pileipellis a cutis of inflated cells 4–10 μm diam., giving rise to terminal hairs with basal clamp connections. Hairs 70–140 × 2.5–8 μm, cylindrical, mostly with acute apices, with secondary septations, thick-walled, dextrinoid, burgundy in water, purplish-grey in KOH and becoming slate blue with time, with golden reddish brown to burgundy incrustations on pileipellis cells and hairs. Pileus trama subregular; hyphae 3–7(–18) μm diam., hyaline, inamyloid, thin-walled. Lamellar trama interwoven; hyphae 3–5.5 μm diam., cylindrical, smooth, hyaline, inamyloid, thin-walled. Stipe tissue monomitic, parallel, tightly packed; stipitipellis composed of repent cortical hyphae and terminal hairs; cortical and medullary hyphae 2–5 μm diam., cylindrical, hyaline to yellow-green, dextrinoid; terminal hairs 88–228 × 3–6 μm, cylindrical, thin- to thick-walled, weakly dextrinoid, light brown to reddish brown with burgundy tints in water, hyaline to light green in KOH. Clamp connections present.

Habitat: Scattered on undetermined decomposing dicot leaves.
Known distribution: Thailand.

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