Public Description of Marasmius purpureisetosus Corner

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Name: Marasmius purpureisetosus Corner
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Description status: Unreviewed

Taxonomic Classification:

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

General Description:

Marasmius purpureisetosus is characterized by a small pileus colored orangish cream with a brown disc and dark brown central spot, a hispid surface with brown to reddish brown pileosetae, subdistant and collariate lamellae, and a glabrous stipe with scattered nodes. Marasmius purpureisetosus and M. berambutanus are the only known members of section Marasmius with pileosetae.

Diagnostic Description:

Pileus 1-4 mm diam., hemispherical to convex, striate, hispid with brown to reddish brown setae, dull, margin orangish cream, disc brown and dark brown spot at centre. Context cream, thin. Lamellae adnate to a small collarium, subdistant (13-17), broad (0.5-1 mm), cream, non-marginate, non-intervenose. Stipe 15-55 × 0.2-0.3 mm, central, cylindrical, wiry, with scattered nodes, glabrous, insititious, apex creamish brown, base light brown to brown; rhizomorphs present.

Odor and taste not distinctive.

Basidiospores 8-10 × 3-5 μm [xm = 8.6 ± 0.6×3.9±0.4μm,Q=1.6-2.9,Qm =2.3,n= 25 spores, s = 1 specimen], ellipsoid, smooth, hyaline, inamyloid, thin-walled. Basidia not observed. Basidioles fusoid to clavate. Cheilocystidia abundant, composed of 2 types of cells: a) Siccus-type broom cells with main body 13-16 × 7-10 μm, clavate to broadly clavate, hyaline to yellow, inamyloid, thick- walled; apical setulae 5-10 × 2-3 μm, cylindrical to conical, obtuse, ranging from 2-4 per cell, yellow, thick-walled; b) non-setulose cells, 23-38 × 6-8 μm, fusoid, hyaline, inamyloid, thin- to thick-walled. Pleurocystidia absent. Pileipellis hymeniform, not mottled, composed of 3 types of cells: a) Siccus-type broom cells with main body 14-20 × 8-15 μm, clavate to broadly clavate or pyriform, hyaline to pale yellow, inamyloid, thick-walled; apical setulae 4-15 × 2-3 μm, conical to cylindrical, obtuse,browntodarkbrown,thick-walled;b) transitional cells, similar to Siccus-type broom cells with main body 17-36 × 9-12 μm, clavate to broadly clavate, with only 2-3 large apical setulae 15-27 × 3-5 μm, cylindrical, conical to subacute, thick-walled; c) pileosetae 80-350 × 8-12 μm, common, lanceolate to fusoid, brown, inamyloid, thick-walled (up to 3 μm). Pileus trama interwoven, inamyloid. Lamellar trama hyphae 3-8(-10) μm diam., interwoven, cylin- drical to inflated, smooth, hyaline, inamyloid, thin-walled, non-gelatinous. Stipitipellis hy- phae 3-5 μm diam., subparallel, cylindrical, dark brown, smooth, inamyloid to weakly dextrinoid, thick-walled (up to 1 μm), non- gelatinous. Stipe trama hyphae 3-6 μm diam., subparallel, cylindrical, hyaline, smooth, weakly dextrinoid, thin-walled, non-gelatinous. Caulocystidia absent. Clamp connections present in all tissues.

Habit, habitat and known distribution. Scattered to gregarious on undetermined dicotyledonous leaves, Java, Malaysia, northern Thailand and Singapore.

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