Public Description of Marasmius kuthubutheenii Y.S. Tan, Desjardin, Vikineswary & Noorlidah

Title: Public Description (Default)
Name: Marasmius kuthubutheenii Y.S. Tan, Desjardin, Vikineswary & Noorlidah
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Description status: Unreviewed

Taxonomic Classification:

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


General Description:

Marasmius kuthubutheenii is characterized by the following features: a convex-depressed pileus 1-3 mm diam coloured light brown to brownish orange (dries tan to pale brown) with a black papilla; 6-9 collariate lamellae with light brown edges; a short wiry stipe (2-4 × 0.1 mm) that is associated with wiry, glabrous rhizomorphs but does not arise directly from them; basidiospores 7.5-10 × 3-4.5 μm (xmm = 8.3 × 3.8 μm); Siccus-type cheilocystidia with narrowly conical, acute setulae 3-5 × 0.5-1 μm; Siccus-type pileipellis broom cells with narrowly conical, acute setulae 4-8 × 0.5-1 μm; and growth on bamboo leaves. The new species is phenetically similar to M. subruforotula Singer from Africa, M. aripoensis (Dennis) Singer from Trinidad, and M. foliicola Singer from Argentina. Marasmius subruforotula differs in forming larger pilei (3-10 mm diam), more lamellae (up to 12), a longer stipe (7-25 mm), and grows on dicotyledonous leaves.

http://www.fungaldiversity.org/fdp/sfdp/FD37-2.pdf


Diagnostic Description:

Pileus 1-3 mm diam, convex to broadly convex, disc depressed with an acute papilla; margin striate; surface dry, dull, glabrous to minutely pruinose; brownish orange (6C4-5) to light brown (7D5) overall with a brown to black papilla, drying tan to pale brown. Lamellae adnate to a collarium, distant (6-9), yellowish white (2A2) with light brown edges. Stipe 2-4 × 0.2 mm, central, cylindrical, filiform, dry, dull, glabrous, insititious, yellowish white at apex, brown at base; associated with brown, wiry, glabrous rhizomorphs but not arising from them.

Basidiospores 7.5-9 (-10) × 3-4 (-4.5) μm [xmr = 7.9-8.7 × 3.7-3.9 μm, xmm = 8.3 ± 0.6 × 3.8±0.1μm,Q=1.8-3,Qmr =1.6-3,Qmm = 2.2 ± 0.3, n = 26 spores per 2 specimens], ellipsoid, smooth, hyaline, inamyloid. Basidia 20-25 × 6 μm, clavate, 4-spored (few observed). Basidioles 19-25 × 5-7 μm, fusoid to clavate. Cheilocystidia numerous, composed of Siccus- type broom cells; main body 8-15 (-17) × (5-) 6-14 (-17) μm, clavate to broadly clavate or subcylindrical, rarely lobed, hyaline, inamyloid, thick-walled; apical setulae (2-) 3-5 × 0.5-1 μm, forked, cylindrical to conical, subacute to obtuse, seldom forked, yellow, inamyloid, thin- to thick-walled. Pleurocystidia absent. Pileipellis mottled, composed of a hymeniform layer of Siccus-type broom cells; main body (7-) 10-16 × (5-) 7-12 μm, clavate to subclavate or sometimes irregular in outline, rarely lobed, hyaline, inamyloid, thick-walled; apical setulae (3-) 4-8 × 0.5-1 μm, cylindrical to conical, subacute to obtuse, seldom forked, brownish yellow to dull yellow, inamyloid, thick-walled. Pileus trama interwoven; hyphae 3-4 μm diam, cylindrical, hyaline, inamyloid, thin-walled, non-gelatinous. Lamellar trama regular; hyphae 5-7 μm diam, cylindrical, hyaline, inamyloid to weakly dextrinoid, thin-walled, non-gelatinous. Stipe tissue monomitic; cortical hyphae 2-5 μm diam, parallel, cylindrical, smooth, yellow at apex, dull yellow at base, dextrinoid to strongly dextrinoid, thick-walled; medullary hyphae 3-4 μm diam, parallel, cylindrical, smooth, hyaline, inamyloid, thick- walled. Caulocystidia absent. Clamp connec- tions present.

Habit, habitat and known distribution: gregarious on bamboo leaves. Malaysia (Negeri Sembilan, Selangor).


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