Leucopaxillus pakistanicus R. Khan, S. Ullah & Khalid, sp. nov.
Creators: name: Khan, Rameez
name: Ullah, Shariat
name: Khalid, Abdul Nasir
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Tricholomataceae
Leucopaxillus
Leucopaxillus pakistanicus

description: Leucopaxillus pakistanicus R. Khan, S. Ullah & Khalid, sp. nov. (Figs. 1–4) MycoBank No.: MB848423
Etymology:— The specific epithet “ pakistanicus ” (Latin) refers to Pakistan, the country in which the type locality is.
Diagnosis:— Pileus brick red or red-brown, slightly thin fleshed; lamellae creamy and thick, short decurrent gills attachment, glutulated; stipe long, cylindrical to subcylindrical, and small in diameter, broadly fistulose, spores thick-walled, cheilocystidia with subcapitate apex.
Type: PAKISTAN. Khyber Pakhtunkhwa Province, Skyland coniferous forest (35°04’35°46ʹʹ N, 71°32’72°22ʹʹE), (3140 m a.s.l.) on soil and leaf litter under Conifers forest, 5 September 2021, Rameez khan & Abdul Nasir Khalid RZ-SL-39 (Holotype, LAH37520: GenBank OP538064).
Description:— Basidiomata medium to large sized and thick fleshed., Pileus 3–6 cm diameter, convex with an inrolled margin in young stage, becoming broadly convex to nearly flat, dark brick or red-brown (7.5RP 4/4), surface smooth and dry, finely velvety, glabrous when wet, margins white and striate, entire to slightly incurved in a young stage, wavy in the mature stage, context fleshy and white with no change in color upon bruising. Lamellae creamy, short decurrent, crowded, broad, thick, rugulose on the side surface, even and entire at edge; lamellulae present in series of 2–3, creamy. Stipe 3–5 × 0.8–1 cm, creamy, central, cylindrical to slightly tapering upward, sub bulbous at the base, firmly attachment, smooth to slightly fibrillose, broadly fistulose. Spore print white. Annulus and volva absent. Odor and taste were not recorded, (Fig. 1).
Basidiospores [50/5/5] (3) 3.5–4.3 (4.7) × (2.5) 2.8–3.6 (3.8) µm, Q= (1.15) 1.2–1.4 (1.5), Qav= 1.24, broadly ellipsoid to subglobose, small, thick-walled, amyloid, hyaline, ornamented; apiculus present, hyaline in 2% KOH, Basidia narrowly clavate; thin-walled 4-spored, sterigmata 1.5–3 µm long. Cheilocystidia 23–30 × 5–7 µm, narrowly uniform to flexuose with an obtuse to sub-capitate apex, thin-walled and hyaline in KOH. Pleurocystidia absent. Hymenophoral trama 4–7 µm, parallel regularly arranged, branched, clamped at septa, hyaline in KOH. Pileipellis is a cutis of smooth filamentous, 2.5–6 µm wide; hyaline in KOH; subcylindrindrical, branched, clamped connection present at septa. Stipitipellis 3–5 µm wide, filamentous, branched, subcylindrindrical, clamped connections present, hyaline as shown in Fig 4.
Additional specimens examined:— PAKISTAN. Khyber Pakhtunkhwa Province, Skyland coniferous forest (35°04’35°46ʹʹ N, 71°32’72°22ʹʹE), (3100 m a.s.l.) on soil and leaf litter under Conifer forest, 12 August 2022, Rameez khan & Abdul Nasir Khalid RZ-DR-249 (Paratype, LAH37521: GenBanK: OQ851496).
description: Published as part of Khan, Rameez, Ullah, Shariat & Khalid, Abdul Nasir, 2024, Leucopaxillus pakistanicus, a new species of (Tricholomataceae: Basidiomycota) from the coniferous forest of Pakistan, pp. 149-156 in Phytotaxa 652 (2) on pages 150-151, DOI: 10.11646/phytotaxa.652.2.7, http://zenodo.org/record/13216669