Alloexidiopsis sinensis J.H. Dong & C.L. Zhao

Dong, Junhong, Gu, Zirui, Wang, Yuyun, Shi, Yinmei & Zhao, Changlin, 2024, A new corticioid fungus, Alloexidiopsis sinensis (Auriculariales, Basidiomycota), in China, evidenced by morphological characteristics and phylogenetic analyses, Phytotaxa 658 (3), pp. 227-239 : 232-235

Alloexidiopsis sinensis J.H. Dong & C.L. Zhao , sp. nov. Figs. 3 , 4 , 5

MycoBank no.: MB 852467

Etymology: — sinensis (Lat.) : referring to the type locality ( China).

Diagnosis: — Differs from other species of Alloexidiopsis in the yellowish-brown to rose to slightly purple hymenial surface, generative hyphae thin- to thick-walled, allantoid basidiospores (14.5–23 × 4.5–6.5 µm).

Holotype: — CHINA. Yunnan Province, Chxiong, Zixishan National Forest Park, 25°01′N, 101°22′E, elev. 2000 m, on the trunk of Quercus , 2 July 2018, CLZhao 7343 (SWFC!).

Basidiomata: — Annual, resupinate, adnate, membranaceous, becoming hard brittle upon drying, very hard to separate from substrate, without odor or taste when fresh, up to 15 cm long, 5 cm wide, 0.2–1 mm thick. Hymenial surface grandinoid, covered by spines, spines 7–10 per mm, up to 0.1 mm long, cream to buff when fresh, turning to yellowish-brown to rose to slightly purple upon drying. Sterile margin distinct, slightly buff, and up to 1 mm wide.

Hyphal structure: — Hyphal system monomitic, generative hyphae with clamp connections, hyaline, thin- to thick-walled, frequently branched, interwoven, 2–3 μm in diameter; IKI–, CB–, tissues unchanged in KOH.

Hymenium: — Cystidia cylindrical with an obtuse apex, 11.5–15.5 × 3–5.5 µm, with a clamp connection at the base; cystidioles absent. Hyphidia arising from generative hyphae, nodulose or branched, colorless, thin-walled, 1.5–3.5 μm in diameter. Basidia ellipsoid to ovoid, longitudinally septate, two to four-celled, 16–22 × 7.5–10 µm; basidioles dominant, similar to basidia in shape, but slightly smaller.

Basidiospores: — Allantoid, colorless, smooth, thin-walled, with 1–2 oil drops, IKI–, CB–, 14.5–23(–25) × (4.2–)4.5–6.5(–6.7) µm, L = 18.38 μm, W = 5.38 µm, Q = 3.13–3.15 (n = 210/7).

Type of rot: — White rot.

Additional specimens examined: — CHINA. Yunnan Province, Puer, Jingdong County, Wuliangshan National Nature Reserve, 24°22′N, 100°45′E, elev. 2200 m, on the branch fallen of angiosperm, 5 October 2017, CLZhao 4146, 4 January 2019, CLZhao 9274, CLZhao 9283 (SWFC!); Yuxi, Xingping county, Tea Horse Ancient Road Scenic Spot, 22°58′N, 101°05′E, elev. 1500 m, on the branch fallen of angiosperm, 13 Janurary 2018, CLZhao 5171, CLZhao 5232, CLZhao 5309, CLZhao 5316, CLZhao 5323, CLZhao 5362, 21 August 2018, CLZhao 8219 (SWFC!); Chxiong, Zixishan National Forest Park, 25°01′N, 101°22′E, elev. 2000 m, on the branch fallen of angiosperm, 30 June 2018, CLZhao 6775, CLZhao 6777, 1 July 2018, CLZhao 7105, CLZhao 7292(SWFC!); Wenshan, Pingba Town, Wenshan National Nature Reserve, 23°18′N, 104°16′E, elev. 1650 m, on the branch fallen of angiosperm, 28 July 2019, CLZhao 16935, CLZhao 16947, CLZhao 16948, CLZhao 16949, CLZhao 16964, CLZhao 17016, CLZhao 17020, CLZhao 17064, CLZhao 17083, CLZhao 17234 (SWFC!).

Figures

FIGURE 3. Basidiomata of Alloexidiopsis sinensis (A, B) CLZhao 7343 (holotype); (C, D) CLZhao 6775; (E, F) CLZhao 16935. Bars: A, C, E= 1 cm; B, D, F= 1 mm.

FIGURE 4. Microscopic structures of Alloexidiopsis sinensis (holotype, CLZhao 7343). (A) Basidiospores; (B) Basidia; (C) Basidioles; (D) Cystidia; (E) Hyphidia; (F) Part of the vertical section of hymenium. Bars: A–F = 10 μm.

FIGURE 5. Sections of hymenium of Alloexidiopsis sinensis (holotype, CLZhao 7343). Scale bars: A, C, E = 20 μm; B, D, F = 10 μm, 10 × 100 Oil.