Tropicoporus zuzaneae A.H. Zhu, Yuan Yuan & S.H. He, 2024

Zhu, An-Hong, Liu, Zhan-Bo, Li, Yue, Liu, Hong-Gao, Yuan, Yuan & He, Shuang-Hui, 2024, Molecular and morphological data reveal two new species of Tropicoporus (Hymenochaetaceae, Basidiomycota) from Australia and tropical Asia, MycoKeys 103, pp. 57-70 : 57

Tropicoporus zuzaneae A.H. Zhu, Yuan Yuan & S.H. He sp. nov.

Figs 4 , 5

Type.

China. Hainan Province, Haikou, Guanlan Lake , on dead tree of Sonneratia , 28.XII.2020, Dai 22171 (holotype, BJFC036063) .

Etymology.

Zuzaneae (Lat.): in honour of the collector Zuzana Egertova.

Description.

Basidiomata. Perennial, resupinate, firmly attached to the substrate, corky and without distinctive odor or taste when fresh, hard corky when dry, up to 40 cm long, 3 cm wide, and 3 mm thick at center. Pore surface pinkish buff when fresh, fawn to snuff brown and cracked when dry, distinctly glancing; sterile margin paler than pores when fresh, pale mouse gray when dry, up to 3 mm wide, distinctly receding; pores angular to circular, 6-8 per mm; dissepiments thin, entire. Subiculum very thin to almost lacking, yellowish brown, corky, less than 0.1 mm thick. Tubes paler than pore surface, brittle, up to 2.9 mm long, annual layers indistinct.

Hyphal structure. Hyphal system dimitic; generative hyphae simple septate; all hyphae IKI-, CB-; tissue becoming blackish brown in KOH.

Subiculum. Generative hyphae hyaline to pale brownish, thin- to thick-walled, unbranched, frequently septate, 2-3 µm in diam; skeletal hyphae brownish, thick-walled with a wide lumen, unbranched, aseptate, strongly flexuous, interwoven, 2-3.5 µm in diam.

Trama of the tubes. Generative hyphae hyaline to pale yellowish, thin- to thick-walled, rarely branched, frequently septate, 1.8-2.8 µm in diam; skeletal hyphae yellowish, thick-walled with a wide lumen, unbranched, aseptate, more or less straight, subparallel along tubes, 2.5-3 µm in diam; hymenial setae absent; cystidioles present, fusoid, hyaline, thin-walled, 15-20 × 3.5-4.5 µm; basidia barrel-shaped, with four sterigmata and a simple septum at the base, 9-11 × 7-8 µm; basidioles dominant in hymenium, capitate, slightly smaller than basidia; rhomboid crystals frequently present in trama and hymenium.

Spores. Basidiospores broadly ellipsoid to subglobose, pale yellowish, slightly thick-walled, mostly collapsed, IKI-, CB(+), 3.8-4.9(-5.1) × (3-)3.1-4.2(-4.4) µm, L = 4.42 µm, W = 3.69 µm, Q = 1.2 (n = 30/1).

Additional specimens (paratypes) examined.

China. Hainan Province, Haikou, Guanlan Lake, on dead tree of Sonneratia , 28.XII.2020, Dai 22168 (BJFC036060, sterile). Indonesia, Borneo, on Rhizopora apiculata , 17.II.2015, Zuzana Egertova, Vlasák JV1502/5-Zuz (JV and BJFC, sterile).

Figures

Figure 4. Basidiomata of Tropicoporus zuzaneae (Dai 22171, holotype).

Figure 5. Microscopic structures of Tropicoporus zuzaneae (drawn from the holotype Dai 22171) a basidiospores b basidia and basidioles c cystidioles d hyphae from subiculum e hyphae from trama. Scale bars: 5 µm (a); 10 µm (b-e).