Candolleomyces crenatus Haqnawaz, Niazi & Khalid, 2025

Candolleomyces crenatus Haqnawaz, Niazi & Khalid sp. nov.

Figs 3 View Figure 3 , 4 View Figure 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 About LAH ). GenBank: PQ 329548 [ ITS], PQ 329553 [ LSU], PQ 369432 About LSU [tef- 1 α]. GoogleMaps

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 About LAH ). GenBank: PQ 329547 [ ITS], PQ 329554 [ LSU], PQ 369433 About LSU [tef- 1 α] GoogleMaps .