Marasmius hinnuleus Berk. & M. A. Curtis, J. Linn. Soc., Bot.
Creators: name: Shay, Jackie E.
name: Desjardin, Dennis E.
name: Perry, Brian A.
name: Grace, Chris L.
name: Newman, Danny S.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Marasmiaceae
Marasmius
Marasmius hinnuleus

description: 35. Marasmius hinnuleus Berk. & M.A. Curtis, J. Linn. Soc., Bot. 10(45): 297. 1868 (1869). (Fig. 23, Plate 8)   
 Type:— CUBA. On dead leaves, October, Wright 155 (K).   
 Description:— Pileus 6–8 mm diam, campanulate to hemispherical, some with a small umbo; margin sulcate; surface dry, rugulose around disc, glabrous along margin; disc dark brown (6 E 6), ferruginous to brownish orange or reddish brown (6 E 7–D6–7) elsewhere. Context thin (<1 mm), white. Lamellae adnate, distant (15–17), no lamellulae, broad, not intervenose; cream to buff (4 A 2–3), edges ferruginous or non-marginate. Stipe 33–52 × 0.5 mm, central, cylindrical, wiry, hollow; surface glabrous; apex light brown (5D5), base dark brown (6 F 8). Odor and taste not distinctive.   
 Basidiospores 10.4–13.6 × 2.4–4 μm [x m = 12.13 ± 0.94 × 3.24 ± 0.49 μm; Q = 3–5; Q m = 3.82 ± 0.45, n = 25, s =1], fusoid to oblong or narrowly ellipsoid, smooth, hyaline, inamyloid, thin-walled. Basidia not observed. Basidioles 22.4–25.6 × 5.6–8 μm, clavate to fusoid, hyaline, inamyloid, thin-walled. Cheilocystidia of Siccus - type broom cells; main body 12–23.2 × 4.8–7.2 μm, clavate to cylindrical, hyaline, inamyloid, apically thick-walled; apical setulae 0.8– 7.2 × 0.8–1.6 μm, cylindrical to conical or irregular, seldom branched, hyaline, inamyloid, thick-walled. Pleurocystidia 36–47.2 × 7–10 μm, common, subcylindrical to fusoid, some mucronate, hyaline, inamyloid, refractive, thin-walled. Pileipellis mottled, a hymeniform layer of Siccus - type broom cells; main body 8–16.8 × 4–7.2 μm, clavate, seldom 2–3 lobed, hyaline, inamyloid, thick-walled; apical setulae 0.8–4.8 × 0.8–1.6, cylindrical to conical, light brown to brown, inamyloid, thick-walled. Pileus trama interwoven; hyphae, 2.4–8 μm diam, cylindrical, smooth, hyaline, dextrinoid, thin-walled. Lamellar trama regular; hyphae 2.4–8.8 μm diam, cylindrical to inflated, hyaline, dextrinoid, thin-walled. Stipe tissue monomitic; cortical hyphae 4.8–7.2 μm diam, parallel, cylindrical, hyaline, dextrinoid, thin-walled; medullary hyphae 4–7.2 μm, cylindrical, parallel, hyaline, dextrinoid, thin-walled. Caulocystidia absent. Clamp connections present.   
Habit, habitat, and known distribution:—Solitary or in small clusters on bamboo debris in groomed park. Cuba, Guadeloupe, Madagascar.  
 Material examined:— MADAGASCAR.Region Analamanga,City of Antananarivo, Parc Botanique de Zoologique (P. B. Z. T.), near the garden of Crops Wild and Relatives (CWR), elev. 1270 m, GPS: 18˚ 55.530’ S, 47˚ 31.350’ E, 8 February 2014, J. E. Shay 217 (TAN).   
 Notes:— Marasmius hinnuleus, described originally from Cuba, is characterized by a small (<10 mm diam), sulcate, brownish orange to reddish brown pileus, distant (15–17), non-marginate lamellae, a non-insititious, glabrous stipe lacking caulocystidia, refractive, often mucronate pleurocystidia 7–10 μm diam, Siccus - type broom cells, and growth on dead leaves. The Madagascan specimen matches quite closely material reported from the Caribbean (Singer 1976, Pegler 1983). The species shows similarities to M. hypophaeus Berk. & M.A. Curtis, M. confertus Berk. & Broome, M. suthepensis, and M. ferrugineus (Berk.) Berk. & M.A. Curtis. Marasmius hypophaeus forms fewer lamellae (11–13) with brownish orange edges, a smaller stipe (23–35 mm long), larger basidiospores (x = 17.2 × 4.0 μm) and strangulate pleurocystidia (Desjardin et al. 2000, Wannathes et al. 2009a). Marasmius confertus and M. suthepensis have nearly smooth pilei and more numerous lamellae with multiple series of lamellulae (Antonín 2007, Wannathes et al. 2009a). Marasmius ferrugineus forms a paler pileus, has fewer lamellae (8–10) and larger basidiospores (x = 17.0 × 4.0 μm) (Singer 1976, Desjardin et al. 2000). An ITS sequence of JES 217 (KX 148988) places M. hinnuleus in a clade with M. hypophaeus and M. grandisetulosus with 89% BS and 1.0 PP support (Fig. 1a).
description: Published as part of Shay, Jackie E., Desjardin, Dennis E., Perry, Brian A., Grace, Chris L. & Newman, Danny S., 2017, Biodiversity and phylogeny of Marasmius (Agaricales, Basidiomycota) from Madagascar, pp. 101-149 in Phytotaxa 292 (2) on pages 144-145, DOI: 10.11646/phytotaxa.292.2.1, http://zenodo.org/record/13697833