Candolleomyces crenatus Haqnawaz, Niazi & Khalid 2025, sp. nov.
Creators: name: Li, Qirui
name: Haqnawaz, Muhammad
name: Niazi, Abdul Rehman
name: Khalid, Abdul Nasir
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Psathyrellaceae
Candolleomyces
Candolleomyces crenatus

description: Candolleomyces crenatus Haqnawaz, Niazi & Khalid sp. nov.
Figs 3, 4
Etymology.
Species name “ crenatus ” (Latin) refers to the crenate cap margins.
Holotype.
Pakistan • Punjab Province: Kot Addu District, Indus Riverbed, (30°28'03"N, 70°49'25"E, 126 m a. s. l.), on loamy soil, rich in organic matter, under Vachellia nilotica, 07 Aug. 2022, Muhammad Haqnawaz, Q – 13 (Holotype LAH 38257). GenBank: PQ 329548 [ITS], PQ 329553 [LSU], PQ 369432 [tef- 1 α].
Diagnosis.
This species is different from Candolleomyces badiophyllus by its convex to plane, crenate cap margins, wrinkled, dull surface, light gray, with dull orange center of pileus, marginate base of stipe, and small basidiospores (7–9 × 4–5 µm).
Description.
Pileus 14–34 mm diameter, convex to plane, straight shape, and crenate cap margins; presence of veil elements; wrinkled, dull surface; light gray (7.5 YR 8 / 1) with dull orange (7.5 YR 7 / 3) center. Lamellae adnexed, ventricose, average, close, fimbriate, unequal, 1–5 tiers, dull reddish brown (5 YR 5 / 3). Stipe 23–35 × 3–5 mm, compressed, flexuous, tomentose, marginate base. Annulus absent. Taste and odor are not recorded.
Basidiospores [150 / 3 / 2], (7 –) 7.5–8.5 (– 9) × (4 –) 4.5–5 (– 5.7) µm, Q = 1.4–1.8, Qav = 1.61, ellipsoid, thick-walled, smooth, rarely guttulate, central germpore present, reddish brown in water. Basidia (15 –) 16–23 (– 24) × (7 –) 7.5–11 (– 12) µm, clavate to broadly clavate, hyaline to yellowish in water, thick-walled, smooth, with 3–4 sterigmata. Cheilocystidia (15 –) 16–31 (– 32) × (7 –) 8–12 (– 13) µm, ellipsoid to broadly ellipsoid, clavate to broadly clavate, globose, utriform to utriform with median constriction, cylindrical, hyaline to yellowish in water, thick-walled. Pleurocystidia absent. Pileipellis an irregular epithelium, thick-walled, 18–30 × 16–24 µm, globose to subglobose and ellipsoid to broadly ellipsoid, clavate to broadly clavate cells, hyaline to light yellowish in water. Stipitipellis a cutis, hyphae subregular, branched 6–17 µm in diameter, thin-walled, septate, and hyaline to yellow in water. Caulocystidia (17 –) 18–42 (– 43) × (8 –) 9–14 (– 15) µm, utriform, clavate to broadly clavate, globose, broadly ellipsoid, hyaline in water. Clamp connections present in all tissues.
Ecology and habitat.
Terrestrial, caespitose, on loamy soil rich in organic matter, under Vachellia nilotica.
Additional material examined.
Pakistan • Punjab Province: Kot Addu, Pirhar Gherbi, (30°25'07"N, 70°52'35"E, 136 m a. s. l.), on loamy soil, 11 Aug. 2023, Muhammad Haqnawaz, HA – 03 (Paratype LAH 38258). GenBank: PQ 329547 [ITS], PQ 329554 [LSU], PQ 369433 [tef- 1 α].
description: Published as part of Li, Qirui, Haqnawaz, Muhammad, Niazi, Abdul Rehman & Khalid, Abdul Nasir, 2025, Phylogenetic studies on the genus Candolleomyces (Psathyrellaceae, Basidiomycota) occurring in the bed of the Indus River, Punjab, Pakistan, reveal three new species, pp. 165-182 in MycoKeys 112 on pages 165-182, DOI: 10.3897/mycokeys.112.141766