Junghuhnia austrosinensis F. Wu, P. Du & X.M. Tian, 2020

Du, Ping, Wu, Fang & Tian, Xue-Mei, 2020, Three new species of Junghuhnia (Polyporales, Basidiomycota) from China, MycoKeys 72, pp. 1-16 : 1

Junghuhnia austrosinensis F. Wu, P. Du & X.M. Tian sp. nov. Figures 2 , 3

Etymology.

Refers to the species being collected in the south of China.

Basidiomata.

Annual, resupinate, soft corky, without odour or taste when fresh, corky when dried, 7 cm length, 4 cm width and 0.4 mm thick at centre. Pore surface white when fresh, cream to buff-yellow when dried; margin distinct, white and nearly 1 mm width; pores round to angular, 9-11 per mm; dissepiments thin, entire. Subiculum cream, paler than tubes, corky when dried, nearly 0.1 mm thick. Tubes concolorous with pore surface, corky, nearly 0.3 mm length.

Hyphal system.

Hyphal system dimitic; generative hyphae with clamp connections, skeletal hyphae IKI-, CB+; tissue unchanged in KOH.

Subiculum.

Dominated by skeletal hyphae; generative hyphae hyaline, thin- to fairly thick walled, rarely branched, 2-3.5 µm in diam.; skeletal hyphae thick-walled with a wide to narrow lumen, flexuous, unbranched, gelatinised, interwoven, 3-4 µm in diam.

Tubes.

Trama dominated by skeletal hyphae; generative hyphae hyaline, thin- to fairly thick walled, rarely branched, 2-3 µm in diam.; skeletal hyphae thick-walled with a wide to narrow lumen, unbranched, more or less straight, subparallel amongst the tube, 2.5-3.8 µm in diam. Skeletocystidia clavate, thick-walled, originated from trama, apex covered with crystals, embedded amongst trama and dissepiments or projecting into hymenium, 30-40 × 6-8 µm; smaller skeletocystidia clavate, thick-walled, 14-18 × 5-6 µm. Basidia barrel-shaped, bearing four sterigmata and a basal clamp connection, 7-8 × 4-4.5 µm; basidioles in shape similar to basidia, but smaller.

Spores.

Basidiospores smooth, ellipsoid, thin-walled, hyaline, IKI-, CB-, (2.4-)2.5-3(-3.1) × (1.6-)1.7-2(-2.1) µm, W = 1.83 µm, L = 2.83 µm, Q = 1.51 (n = 30/1).

Materials examined.

China, Yunnan Province, Jinghong, Virgin Forest Park, on fallen bamboo, 17.VI.2017 Dai 17540 (holotype, BJFC025072, isotype in IFP). Hainan Province, Wuzhishan County, Wuzhishan Forest Park, on fallen angiosperm branch, 9.IX.2019 Dai 17679 (paratype, BJFC025211).

Figures

Figure 2. Basidiomata of Junghuhnia austrosinensis (holotype Dai 17540). Scale bar: 10 mm.

Figure 3. Microscopic assessment of Junghuhnia austrosinensis structures (drawn from Dai 17540) a basidiospores b basidia and basidioles c cystidioles d two kinds of skeletocystidia e hyphae from subiculum f hyphae from trama.