Candolleomyces undulatus 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 undulatus

description: Candolleomyces undulatus Haqnawaz, Niazi & Khalid sp. nov.
Figs 5, 6
Etymology.
Species name “ undulatus ” (Latin) refers to the wavy cap margins.
Holotype.
Pakistan • Punjab Province: Kot Addu District, Indus Riverbed, (30°25'33"N, 70°52'12"E, 130 m a. s. l.), on loamy soil, rich in organic matter, under Phoenix dactylifera, 28 Aug. 2020, Muhammad Haqnawaz, KA – 39 (Holotype LAH 38255). GenBank: PQ 329546 [ITS], PQ 329551 [LSU], PQ 369428 [tef- 1 α].
Diagnosis.
This species is different from its closest species by parabolic to campanulate, wavy margins, light purplish gray with light brownish gray center of pileus, appendiculate, pendant annulus, oblong to ellipsoid, globose, ovoid, cheilocystidia, and caulocystidia.
Description.
Pileus 10–27 mm diameter, parabolic to campanulate, straight shape and wavy cap of margins, presence of veil elements, light purplish gray (5 P 7 / 1), and light brownish gray (5 YR 7 / 2) center. Lamellae adnexed to adnate, narrow, average, close, eroded, unequal, 1–3 tiers, light reddish gray (7.5 R 7 / 1), Stipe 15–46 × 2–4 mm, concolourous to pileus, punctate, flexuous, tomentose. Annulus appendiculate and pendant. Taste and odor not recorded.
Basidiospores [150 / 3 / 2], (6 –) 6.5–7.5 (– 8) × (3.5 –) 4–5 (– 6.6) µm, Q = 1.15–1.94, Qav = 1.58, ellipsoid to oblong, thick-walled, smooth, guttulate, germpore present, brownish with yellowish guttule in water. Basidia (15 –) 16–24 (– 25) × (7 –) 7.5–11 (– 12) µm, clavate to broadly clavate, rarely cylindrical, spherical with broad peduncle, hyaline in water, thick-walled, smooth, with 2–4 sterigmata. Cheilocystidia (15 –) 16–31 (– 32) × (7 –) 8–12 (– 13) µm, oblong to ellipsoid, globose, ovoid, utriform, hyaline in water, thick-walled. Pleurocystidia absent. Pileipellis an irregular epithelium, thick-walled, 18–30 × 16–24 µm diameter, globose to subglobose and ellipsoid to broadly ellipsoid, hyaline in water. Stipitipellis a cutis, hyphae subregular, branched 7–18 µm in diameter, thin-walled, septate, hyaline in water. Caulocystidia 17 –) 18–42 (– 43) × (8 –) 9–14 (– 15) µm, utriform, clavate to broadly clavate, ovoid, spheropedunculate, globose, hyaline in water. Clamp connection present in all tissues.
Ecology and habitat.
Terrestrial, connate, on loamy soil rich in organic matter, under Phoenix dactylifera.
Additional material examined.
Pakistan • Punjab Province: Kot Addu, Noor Shah Thal, (30°27'39"N, 70°52'40"E, 129 m a. s. l.), on loamy soil, 11 Aug 2021, Muhammad Haqnawaz, SSC – 44 (Paratype LAH 38256). GenBank: PQ 329545 [ITS], PQ 329552 [LSU], PQ 369429 [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