Public Description of Marasmius hypochroides Berk. & Broome

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Name: Marasmius hypochroides Berk. & Broome
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Description status: Unreviewed

Taxonomic Classification:

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

General Description:

Marasmius hypochroides is characterized by a relatively large, rugulose, striate to sulcate pileus colored brownish orange to yellowish brown with dark brown disc, distant (12-16), broad (2-10 mm) lamellae, moderately broad basidiospores with mean 9.9 × 5.6 μm, and mean Q = 1.8, cheilocystidia with very long setulae (4-32 μm), and an absence of pleurocystidia and caulocystidia. The Thai specimens match nicely those from Java reported by Desjardin et al. (2000). For a comparison with similar species, refer to Desjardin et al. (2000).

Diagnostic Description:

Pileus 17-56 mm diam., convex to plano- convex or applanate, often subumbonate, rugulose, striate to sulcate, glabrous to subvelutinous, dull, disc brown (7E8) to dark brown (7F7-8), margin brownish orange (5C5) to yellowish brown (5E6). Context yellowish white to cream, thin. Lamellae free to adnexed, distant (12-16) with 3-4 series of lamellulae, broad (2-10 mm), often intervenose, cream (4B2) with brownish orange edges. Stipe 38-95 × 1-3 mm, central, cylindrical, wiry, hollow, glabrous, non-insititious, apex buff, base yellowish brown (5D8) to reddish brown (8E7). Odor and taste not distinctive.

Basidiospores (8-)9-12(-13) × 5-6(-8)μm [xmr = 8.9-10.8 × 5.1-6.2 μm, xmm = 9.9 ± 0.7 × 5.6±0.4μm,Qmr =1.6-2.0,Qmm =1.8±0.1,n = 25 spores, s = 6 specimens], ellipsoid, smooth, hyaline, inamyloid, thin-walled. Basidia not observed. Basidioles cylindrical to clavate. Cheilocystidia common, of Siccus-type broom cells; main body (8-)10-25 × 4-10 μm, cylindrical to clavate or pyriform, hyaline, inamyloid, thin-walled; apical setulae 4-23(-32) × 1-1.5 μm, cylindrical, inamyloid, subacute, brown to light brown, thin- to thick-walled. Pleurocystidia absent. Pileipellis hymeniform, mottled, composed of Siccus-type broom cells; main body 8-19(-26) × 5-11 μm, clavate to broadly clavate or pyriform, often branched, hyaline, inamyloid, thin- to thick walled; apical setulae 3-11(-18) × 1-2 μm, crowded, cylindrical, subacute to acute, brown to dark brown, thick-walled. Pileus trama interwoven, dextrinoid to weakly dextrinoid. regular to interwoven, cylindrical, smooth, hyaline, weakly dextrinoid to dextrinoid, thin-walled, non-gelatinous. Stipitipellis hyphae 3-6 μm diam., subparallel, cylindrical, light brown to brown, smooth, dextrinoid, thin- to thick- walled, non-gelatinous. Stipe trama hyphae 7- 12(-18) μm diam., subparallel, cylindrical, hyaline, smooth, dextrinoid, thin-walled, non- gelatinous. Caulocystidia absent. Clamp connections present in all tissues.

Habit, habitat and known distribution: Scattered to solitary on dicotyledonous leaves or on wood. Java, Malaysia, Northern Thailand and Sri Lanka.

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