Pallidohirschioporus brastagii (Corner) Y.C. Dai, Yuan Yuan & Meng Zhou

Saha, Rituparna, Dutta, Arun Kumar & Acharya, Krishnendu, 2024, Nigrohirschioporus violacaeruleum sp. nov. and a new record of Pallidohirschioporus brastagii (Basidiomycota, Hymenochaetales) from India, Phytotaxa 634 (2), pp. 131-142 : 139-141

Pallidohirschioporus brastagii (Corner) Y.C. Dai, Yuan Yuan & Meng Zhou Figs. 4 , 5

Basidiocarps annual, sessile, broadly attached to the substratum, pileate, imbricate, dimidiate, 25‒50 × 20‒35 mm in diam., 1‒3 mm thick, coriaceous on drying. Pileus upper surface velutinate to adpressed hispid, reddish grey (7B2) with brownish orange (7C4) concentric zonations, sometimes with algal association; margin undulate, acute, thin, incurved on drying, reddish grey (7B2). Hymenophore poroid to irpicoid, brownish orange (7C3), pores angular, 2‒4 per mm. Context white (1A1), 1‒1.5 mm thick, fibrous. Tube layer concolorous to the context, 1‒2 mm deep, not stratified.

Hyphal system dimitic. Generative hyphae solid, thin-walled, sometimes thick-walled, hyaline, clamped, branched, 2.5‒5.5 mm wide. Skeletal hyphae thick-walled with narrow lumen, hyaline, non-septate, 3.75‒5.5 µm wide. Cystidia thick-walled, up to 1.5 µm thick, hyaline, fusoid, sometimes clavate, apically encrusted, apex obtuse, 17.5‒47.5 × 4.5‒5.5 µm in diam. with basal clamp connections. Basidia thin-walled, hyaline, 4-sterigmate, sub-clavate, 12.5‒20 × 3.5‒5.5 µm in diam. Basidiospores hyaline, thin-walled, smooth, cylindrical, non-amyloid, (3.0–)4.3–5.0(–5.3) × (1.5–)1.8–2.3(–2.5) μm, Z avg = 4.6 ± 0.4 × 2.1 ± 0.3 μm, Q = 1.3–2.8, Q avg = 2.2 ± 0.3.

Habit and habitat: —Caespitose to gregarious, grown on dead wood of angiosperm.

Specimens examined: — India. West Bengal: Kalimpong District,Algarah, 16 th Mile, 27°11’71.7”N, 88°58’36.9”E, elev. 1,780 m, 4 August 2019, R. Saha, RS−37/2019 (CUH AM768). India. West Bengal: Kalimpong District, Algarah, 16 th Mile, 27°11’71.7”N, 88°58’36.9”E, elev. 1,780 m, 4 August 2019, R. Saha, RS−40/2019 (CUH AM783)

Remarks: — Pallidohirschioporus brastagii possess annual, sessile, pileate, imbricate basidiocarps; velutinate to adpressed hispid, reddish grey upper surface with brownish orange concentric zonations; poroid to irpicoid, brownish orange hymenophore; presence of apically encrusted, thin to thick-walled, fusoid cystidia; cylindrical, basidiospores measuring 3‒5.5 × 1.5‒2.5 µm with mean Q value of 2.17.

Figures

FIGURE 4. Field photographs of basidiocarps. a–b basidiocarps of Pallidohirschioporus brastagii in natural habitat, showing pileus and pore surface morphology (CUH AM768). Photographed by: R. Saha. Scale bar = 20 mm.

FIGURE 5. Microscopic characteristics of Pallidohirschioporus brastagii (CUH AM768). (a) Basidia, (b) Thick-walled cystidia, (c) Skeletal hyphae, (d) Generative hyphae, (e) Basidiospores. Scale bars: (a–e) = 5 µm. Drawings by: R. Saha.