Aurantiporus orientalis Y. C. Dai, Xin Zhang, Ghobad-Nejhad & Yuan Yuan, 2024

Zhang, Xin, Zhou, Hong-Min, Ghobad-Nejhad, Masoomeh, Liu, Hong-Gao, Vlasák, Josef, Dai, Yu-Cheng & Yuan, Yuan, 2024, Molecular and morphological data reveal two new polypores (Polyporales, Basidiomycota) with reddish brown to orange basidiomata from China, MycoKeys 107, pp. 75-94 : 75-94

Aurantiporus orientalis Y. C. Dai, Xin Zhang, Ghobad-Nejhad & Yuan Yuan sp. nov.

Figs 2 , 3

Holotype.

China, Jilin Province, Antu County, Changbaishan Nature Reserve , on living tree of Quercus mongolica , 4 July 2022, Dai 23714 ( BJFC 038959 ).

Etymology.

Orientalis (Lat.) : refers to the species occurring in East Asia.

Diagnosis.

Aurantiporus orientalis is characterized by pileate, imbricate, triquetrous basidiomata with apricot-orange pores when fresh, that become honey yellow upon drying and reddish in KOH solution, large pores 1–2 per mm, the presence of cystidioles, broadly ellipsoid basidiospores measuring 3.4–4 × 2.5–3 μm, and growing on Quercus in Northeast China.

Fruitbody.

Basidiomata annual, pileate, imbricate, inseparable from the substrate, watery to soft corky and without odor or taste when fresh, shrinking and becoming brittle to hard corky upon drying. Pilei triquetrous, projecting up to 10 cm, 15 cm wide and 3 cm thick at base. Pileal surface orange-yellow when fresh, becoming honey-yellow upon drying, matted. Pore surface apricot-orange when fresh, becoming fuscous to date brown upon drying; sterile margin distinct, concolorous with pileal surface, up to 3 mm wide; pores angular to irregular, 1–2 per mm; dissepiments thin, lacerate. Context clay-buff and hard corky when dry, up to 2.5 cm thick, becoming reddish in KOH solution. Tube layer concolorous with pore surface, brittle to rigid, up to 5 mm deep.

Hyphal structure.

Hyphal system monomitic; generative hyphae bearing clamp connections, richly encrusted with fine yellowish crystals, IKI –, CB –; tissue becoming reddish in KOH solution.

Context.

Generative hyphae hyaline, slightly thick- to thick-walled, occasionally branched, flexuous, interwoven, 2.5–5 µm in diam.

Tubes.

Generative hyphae hyaline, thin- to slightly thick-walled, occasionally branched, flexuous to straight, interwoven, 2–4 µm in diam. Cystidia absent; cystidioles present, clavate to fusoid, thin-walled, smooth, 16–24 × 4–5.5 µm; basidia clavate, bearing four sterigmata and a basal clamp connection, 21–26 × 5–7 μm; basidioles similar in shape to basidia, but smaller.

Spores.

Basidiospores broadly ellipsoid, hyaline, thin-walled, smooth, some with one or two guttules, IKI –, CB –, (3.3 –) 3.4–4 (– 4.1) × 2.5–3 μm, L = 3.69 μm, W = 2.76 μm, Q = 1.34 (n = 30 / 1).

Ecology and distribution.

Growing on living tree of Quercus mongolica . Known from the type location only.

Type of rot.

White rot.

Specimens examined / studied.

The holotype.

Figures

Figure 2. Basidiomata of Aurantiporus orientalis (Dai 23714).

Figure 3. Microscopic structures of Aurantiporus orientalis (Dai 23714, holotype) a basidiospores b basidia and basidioles c cystidioles d hyphae from context e hyphae from tube trama.