Public Description of Gymnopus pleurocystidiatus Desjardin & B.A. Perry

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Name: Gymnopus pleurocystidiatus Desjardin & B.A. Perry
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Description status: Unreviewed

Taxonomic Classification:

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

General Description:

Gymnopus pleurocystidiatus is characterized by convex, felted, cream-colored pileus with central brown fibrils, subdistant, buff lamellae, a white-pruinose, buff to brown stipe, relatively long and narrow basidiospores with mean 8.8  3.0 μm, abundant, cylindrical to fusoid cheilocystidia, pleurocystidia and caulocystidia, clamp connections, and growth on woody debris.

Diagnostic Description:

Etymology – referring to the abundant pleurocystidia, unusual in species of Gymnopus.

Diagnosis – Pileus 15–33 mm diam, broadly convex, smooth to minutely rugulose, margin short-striatulate; surface dull, dry, glabrous to appressed-fibrillose or felted, cream (4A3) with brown fibrils on the disc. Context thin (–1 mm), white. Lamellae adnate to shallowly adnexed, subdistant with 3–4 series of lamellulae, narrow (1–2 mm), off-white to buff, edges concolorous. Stipe 22–33  1.5–2.5 mm, central to slightly eccentric, cylindrical above a slightly broader or subbulbous base, though, pliant, hollow, insititious; surface dull, dry, white-pruinose overall; apex off-white to buff, grading below to brown or dark brown (7–8E5–6).

Basidiospores 7.7–10  2.5–3.5 μm [xm = 8.8 ± 0.7  3.0 ± 0.28 μm, Q = 2.4–3.4, Qm = 2.99 ± 0.19, n = 20, s = 1], subcylindrical to elongate-ellipsoid or subfusoid, smooth, hyaline, inamyloid, thin- walled. Basidia not observed, presumably 4-spored (spore-tetrads observed). Basidioles 16–24  4.5–6 μm, cylindrical to fusoid, clamped. Hymenial cystidia abundant, present as cheilocystidia (lamellar edge primarily sterile) and pleurocystidia, exudative, arising from the lamellar trama; 45–60  8–13 (– 16) μm, subcylindrical to clavate or fusoid, seldom subfusoid, pedicellate, obtuse, hyaline, inamyloid, thin-walled. Pileipellis a cutis of repent, radially arranged to slightly interwoven hyphae 2.5–6.5 (–8) μm diam, cylindrical, smooth or weakly incrusted, non-diverticulate or with scattered rod-like to knob- like outgrowths (a poorly developed Rameales-structure), pale yellow to yellowish brown, pigments intraparietal, inamyloid, non-gelatinous, thin-walled or with walls up to 0.8 μm thick; terminal cells undifferentiated or with a few broad, cylindrical to knob-like outgrowths. Pileus trama interwoven; hyphae 3–13 μm diam, cylindrical, hyaline, inamyloid, non-gelatinous, thin-walled. Lamellar trama subparallel to nearly divergent; hyphae 3–13 μm diam, cylindrical, hyaline, inamyloid, non-gelatinous, thin-walled or with walls up to 0.8 μm thick. Stipitipellis a cutis with abundant, scattered to clustered caulocystidia; cortical hyphae 2.5–6.5 μm diam, cylindrical, hyaline (apex) to yellowish brown (base), inamyloid, non-incrusted, non-gelatinous, thin-walled; medullary hyphae 2.5–10 μm diam, cylindrical, hyaline, inamyloid, thin-walled. Caulocystidia 22–64 (–86)  4–10 μm, cylindrical to subfusoid, obtuse, sometimes geniculate, hyaline, inamyloid, thin-walled or with walls up to 1 mm thick. Clamp connections present in all tissues.
Habitat and known distribution – Scattered on decaying wood in secondary coastal forest. Africa (Príncipe).

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