Index Fungorum number: IF 287956; MycoBank number: MB 287956
Pileus 3–7 mm diam, paraboloid to convex, umbilicate, with a small reddish-brown papilla in the umbilicus, striate; surface dull, dry, glabrous to minutely subvelutinous; disc brownish yellow to pale rusty brown, margin greyish orange (6B4–5) to light yellow (4A4). Context thin, cream (3A2). Lamellae adnate to a collarium, distant (9–10) with no lamellulae, nonintervenose, broad (0.8–1 mm), cream (3A2) with orange edges. Stipe 27–34 × 0.1–0.2 mm, central to eccentric, cylindrical, terete, wiry, tough, glabrous, insititious, reddish brown (7E6) overall; rhizomorphs absent. Odour and taste not distinctive.
Basidiospores (8–)10–12 × (4.5–)5–7 mm [xmr = 9.3–11.1 × 5.1–6.5 mm, xmm = 10.2 ± 0.9 × 5.8 ± 0.7 mm, Q = 1.5–2.0, Qmr = 1.6–2.0, Qmm = 1.8 ± 0.2, n = 25 spores per 1 specimen], ellipsoid, smooth, hyaline, inamyloid, thin-walled. Basidia and basidioles clavate to cylindrical. Cheilocystidia common, of Siccus-type broom cells; main body 12–15 × 6–8 mm, cylindrical to pyriform, clavate or broadly clavate, rarely lobed, hyaline, thin-walled; apical setulae 3–5 × 0.8–1.0 mm, crowded, cylindrical to conical or wavy, obtuse to subacute, yellow, inamyloid, thin-walled. Pleurocystidia absent. Pileipellis hymeniform, weakly mottled, composed of Siccus-type broom cells; main body 14–20 × 8–14 mm, pyriform to clavate or broadly clavate, sometimes irregular in outline, seldom lobed, pale yellow, inamyloid, thin- to thick-walled; apical setulae (2–)4–8 × 1–1.5(–2) mm, cylindrical to conical or irregular in outline, obtuse to subacute, yellow to yellowish brown or tawny, inamyloid, thick-walled. Pileus trama and lamellar trama interwoven; hyphae 4–8 mm diam, cylindrical, smooth, hyaline, inamyloid, thin-walled, non-gelatinous. Stipe tissue monomitic; cortical hyphae 3–4 mmdiam, parallel, cylindrical, smooth, light brown, inamyloid, thick-walled (> 1 mm), non-gelatinous; medullary hyphae 2–3 mm diam, parallel, cylindrical, smooth, hyaline, inamyloid, thin-walled. Caulocystidia absent. Clamp connections present
Habitat: Scattered to gregarious on undetermined dicotyledonous leaves. Florida, Guadeloupe, Mexico, Ecuador, Papua New Guinea, Java, Thailand.
Material examined: Thailand: Chiang Mai Province: New Waterfall near 36 km marker on Hwy 1095, 20 Aug 2004, N. Wannathes 257 (CMU, SFSU).
Notes: The material from northern Thailand fits within the concept of M. ruforotula as it occurs in the old world tropics as reported by Desjardin & Horak (1997) and Desjardin et al. (2000), although there are subtle differences. The Thai material has larger basidiospores with mean 10 × 6 mm versus 8.5 × 4.5 mm from Indonesia. Spore size and other basidiome features match quite closely those reported for M. gordipes, a species described from Melaka State, Malaysia. However, the latter species was characterized as having a reddish brown pileus and an exceptionally long stipe, measuring 60– 130 mm, and with Siccus-type broom cells that have fewer and more blunt setulae (Pegler 1986).
Fig. 1 Marasmius ruforotula (N. Wannathes 257). (A) Basidiomes. (B) Basidium and basidioles. (C) Basidiospores. (D) Cheilocystidia. (E) Pileipellis. Bar: (A) 20 mm; (B–E) 10 mm.
Wannathes N, Desjardin DE, Lumyong S 2007– Mating studies, new species, and new reports of Marasmius from northern Thailand. Mycological Research 111: 985-996. https://doi.org/10.1016/j.mycres.2007.06.013
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