Junghuhnia subcollabens 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 subcollabens F. Wu, P. Du & X.M. Tian sp. nov. Figures 6 , 7

Etymology.

Refers to the species similar to J. collabens .

Basidiomata.

Annual, resupinate, coriaceous, without odour or taste when fresh, hard corky when dried, 8 cm length, 3 cm width and 1.5 mm thick. Pore surface pale salmon when fresh, brownish-vinaceous when dried; margin indistinct to almost lacking; pores round to angular, 10-12 per mm; dissepiments thin to fairly thick, entire. Subiculum vinaceous, darker than pores, hard corky when dried, nearly 0.3 mm thick. Tubes vinaceous, distinctly darker than pore surface, rigid, nearly 1.2 mm length.

Hyphal system.

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

Subiculum.

Dominated by skeletal hyphae; generative hyphae hyaline, thin- to fairly thick-walled, frequently branched, 2.5-3 µm in diam.; skeletal hyphae thick-walled with a wide to narrow lumen, flexuous, occasionally branched, more or less gelatinised, interwoven, 2-4 µm in diam.

Tubes.

Trama dominated by skeletal hyphae; generative hyphae hyaline, thin- to fairly thick-walled, frequently branched, with both simple septa and clamp connections, simple septa especially common at dissepiment edge, 2-3.2 µm in diam.; skeletal hyphae thick-walled with a wide to narrow lumen, rarely branched, flexuous, more or less gelatinised, interwoven, 2.5-3.5 µm in diam. Skeletocystidia clavate, thick-walled, originated from trama, apex covered with crystals, embedded amongst trama and dissepiments or projecting into hymenium, 35-50 × 6-9 µm. Fusoid cystidioles present, 8-14 × 3.5-2.5 µm; basidia clavate, bearing four sterigmata and a basal clamp connection, 10-12 × 4-5 µm; basidioles in shape similar to basidia, but smaller.

Spores.

Basidiospores mostly lunate, hyaline, thin-walled, smooth, sometimes with one or two small guttules, IKI-, CB-, (2.8-)2.9-3.4(-3.5) × (1.5-)1.6-1.8(-1.9) µm, L = 3.12 µm, W = 1.67 µm, Q = 1.87 (n = 30/1).

Materials examined.

China, Yunnan Province, Yongping County, Baitaishan Forest Park, on rotten angiosperm wood, 7.XI.2018 Dai 19345 (holotype, BJFC027813, isotype in IFP) and Dai 19344 (paratype, BJFC027812).

Figures

Figure 6. Basidiomata of Junghuhnia subcollabens (holotype Dai 19345). Bar: 10 mm.

Figure 7. Microscopic structures of Junghuhnia subcollabens (holotype Dai 19345) a basidiospores b basidia and basidioles c cystidioles d skeletocystidia e hyphae and skeletocystidia at dissepiment f hyphae from subiculum g hyphae from trama.