Nigroporus australianus Y. C. Dai, X. L. Li & Yuan Yuan, 2025

Li, Xiang-Lin, Dai, Yu-Cheng, Liu, Zhan-Bo, Jiang, Yu-Han, Liu, Hong-Gao & Yuan, Yuan, 2025, Phylogeny and taxonomy of Nigroporus (Polyporales, Basidiomycota) with four new species from Asia and Oceania, MycoKeys 112, pp. 211-232 : 211-232

Nigroporus australianus Y. C. Dai, X. L. Li & Yuan Yuan sp. nov.

Figs 3 , 4

Holotype.

Australia • Queensland, Cairns, Crater Lakes National Park , on fallen angiosperm trunk, 17 May 2018, Cui 16775 ( BJFC 030074 ).

Etymology.

Australianus (Lat.): refers to the species being found in Australia.

Description.

Basidiomata. Annual, pileate, solitary to imbricate, leathery and without odor or taste when fresh, becoming woody hard and light in weight upon drying; pilei semicircular to flabelliform, projecting up to 3.4 cm, 7.2 cm wide and 3.5 mm thick at base. Pileal surface bay to purplish chestnut when fresh, becoming grayish brown to fuscous upon drying, concentrically zonate, glabrous, margin thin. Pore surface vinaceous when drying; sterile margin indistinct; pores round to angular, 9–10 per mm; dissepiments thin, lacerate. Context fawn, corky when dry, up to 0.5 mm thick. Tubes chestnut, corky when dry, up to 3 mm long.

Hyphal structure. Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae IKI –, CB –; tissues darkening in KOH.

Context. Generative hyphae hyaline, thin- to slightly thick-walled, occasionally branched, 3.2–6.4 µm in diam.; skeletal hyphae yellowish brown, thick-walled with a wide to narrow lumen, unbranched, slightly flexuous, interwoven, 3.2–5.4 µm in diam.

Tubes. Generative hyphae hyaline, thin-walled, occasionally branched, 2.8–5.0 µm in diam.; skeletal hyphae dominant, yellowish brown, thick-walled with a narrow lumen, unbranched, slightly flexuous, interwoven, 2.8–3.8 µm in diam. Cystidia absent; cystidioles frequent, fusoid, hyaline, thin-walled, smooth, 7–9.7 × 3.2–3.8 µm. Basidia barrel-shaped, with four sterigmata and a basal clamp connection, 8.9–11 × 4.1–4.6 µm. basidioles of similar shape to basidia, but smaller.

Spores. Basidiospores allantoid, hyaline, thin-walled, smooth, IKI –, CB –, (3.2 –) 3.4–4.1 (– 4.2) × (1.2 –) 1.3–1.5 µm, L = 3.62 µm, W = 1.4 µm, Q = 2.59 (n = 30 / 1).

Figures

Figure 3. A basidioma of Nigroporus australianus (holotype, Cui 16775). Scale bar: 1 cm.

Figure 4. Microscopic structures of Nigroporus australianus (holotype, Cui 16775) a basidiospores b basidia c basidioles d cystidioles e hyphae from context f hyphae from trama.