Public Description of Marasmius eyssartieri V. Antonín & B. Buyck

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Name: Marasmius eyssartieri V. Antonín & B. Buyck
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Description status: Unreviewed

Taxonomic Classification:

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

General Description:

Notes: The here newly described Marasmius eyssartieri is characterised by having a very small, brown to reddish brown, palely striate pileus, distant lamellae, a dark reddish brown stipe, moderately large basidiospores and well- developed pleurocystidia. Marasmius grandisetulosus Singer, an African species having also a striate pileus, differs by a distinctly larger pileus of (7–)20–25 mm, a stipe measuring 15–85 × 0.5–2 mm, distinctly larger basidiospores of 17–21.5(–23) × 3.5–5.4 μm, and larger pleurocystidia measuring 27–73 × 5.4–15.5(–20) μm (Singer 1964, 1965; Antonín, 2006).

Diagnostic Description:

Pileus up to 5 mm broad, conical, obtuse or papillate at centre, sulcate, with a crenulate margin, brown to reddish brown (7–9E8), slightly paler (up to ochraceous) striate. Lamellae distant, L = 14–15, l = 0–1, emarginate, with brown coloured, pubescent edge. Stipe up to 50 mm long, ± cylindrical, smooth, glabrous, non-insititious, reddish brown (± 8E8). (Description according to a slide and dry carpophores.)

Basidiospores 13.5–16 × 3.5–5 μm, E = 2.8–4.3, Q = 3.4, clavate, fusoid-clavate, thin-walled, hyaline, non-dextrinoid. Basidioles 12–30(–33) × 3.5–8(–9) μm, clavate, fusoid, cylindrical. Cheilocystidia in the form of broom-cells of the Siccus-type, 12–18 × (5–)6–9 μm, clavate, cylindrical, thin- walled sometimes with slightly thick-walled apex and thick-walled projections. Pleurocystidia 30–50 × 8–14 μm, clavate, (sub)fusoid, sometimes rostrate, thin-walled, with a refractive contents. Trama hyphae ± cylindrical, ± thin- walled, hyaline, dextrinoid, up to 12(–15) μm wide. Pileipellis a hymeniderm consisting of broom-cells of the Siccus-type, 10–15 × 6–9 μm, clavate, subcylindrical, pyriform, thin-walled with slightly thick-walled apex or entirely slightly thick-walled, with up to 35(–40) strongly nodulose, digitate, obtuse to subacute, up to 8(–10) × 1.5(–2) μm large projections. Stipitipellis a cutis composed of cylindrical, parallel, slightly thick-walled, dextrinoid, up to 5(–6) μm wide hyphae with ochraceous-yellow walls in KOH. Caulocystidia absent. Clamp connections present in all tissues.

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