Bjerkandera fulgida Y.C. Dai & Chao G. Wang, 2021

Wang, Chao-Ge, Vlasak, Josef & Dai, Yu-Cheng, 2021, Phylogeny and diversity of Bjerkandera (Polyporales, Basidiomycota), including four new species from South America and Asia, MycoKeys 79, pp. 149-172 : 149

Bjerkandera fulgida Y.C. Dai & Chao G. Wang sp. nov. Figs 4 , 5

Diagnosis.

Bjerkandera fulgida is characterised by the clay buff to pale brown and shiny pore surface, and ellipsoid to broadly ellipsoid basidiospores measuring 3.9-4.5 × 2.8-3.3 μm.

Type.

China. Hainan Province, Lingshui County, Diaoluoshan Forest Park, 18°42'N, 109°49'E, rotten angiosperm wood, 13.XI.2015, Y.C. Dai 16107 (holotype BJFC020200) .

Etymology.

Fulgida (Lat.): referring to the species having the shiny pore surface.

Basidiomata.

Annual, effused-reflexed, soft corky, without odor or taste when fresh, becoming corky upon drying, resupinating up to 5.5 cm long, 3 cm wide and 1.3 mm thick, with a pileal projection up to 0.6 cm, 2.3 cm wide and 1.3 mm thick at base. Pileal surface pinkish buff to clay-buff, glabrous and faintly zonate when dry; margin acute. Pore surface clay-buff to pale brown, bruised part becoming dark brown to black when dry, shiny; sterile margin up to 2 mm wide; pores round or sometimes angular, 6-8 per mm; dissepiments thin, entire. Context pale cream, slightly fibrous to corky, up to 0.5 mm thick. Tubes concolorous with the pore surface, darker than context, corky, up to 0.8 mm long, with a distinct dark line between tubes and context.

Hyphal structure.

Hyphal system monomitic; generative hyphae with clamp connections, smooth, hyaline to yellowish, CB+, IKI-; tissues becoming dark in KOH.

Context.

Hyphae thick-walled with a wide lumen, occasionally branched, loosely interwoven, 3-5 μm in diam.

Tubes.

Hyphae thin- to slightly thick-walled, frequently branched, agglutinated and loosely interwoven, 2.5-3.5 μm in diam. Cystidia and cystidioles absent. Basidia clavate to more or less pyriform, with four sterigmata and a basal clamp connection, 10-12 × 4-5.5 μm; basidioles of similar shape to basidia, but smaller. Crystals present among hymenium.

Basidiospores.

Ellipsoid to broadly ellipsoid, hyaline, thin-walled, smooth, CB-, IKI-, (3.8-)3.9-4.5 × (2.6-)2.8-3.3(-3.4) µm, L = 4.21 μm, W = 3.02 μm, Q = 1.37-1.43 (n = 90/3).

Additional specimens (paratypes) examined.

China. Yunnan Province, Jinghong, Sanchahe Nature Reserve, 22°09'N, 100°51'E, fallen angiosperm trunk, 24. VI. 2011, Y.C. Dai 12284 (BJFC010566); Xishuangbanna Tropical Botanical Garden, fallen angiosperm trunk, 21°55'N, 101°15'E, 21.X.2013, Y.C. Dai 13597 (BJFC015059).

Remarks.

Bjerkandera fulgida is characterised by the resupinate to effused-reflexed basidiomata, clay buff to pale brown and shiny pore surface, and ellipsoid to broadly ellipsoid basidiospores measuring 3.9-4.5 × 2.8-3.3 μm. Phylogenetically, Bjerkandera resupinata nests in a sister clade to B. fulgida (Fig. 1 ), also having morphological similarities, as the pore surface coloration and presence of branched hyphae in the tubes. However, B. resupinata differs in having resupinate basidiomata, larger pores (4-6 per mm), and basidiospores measuring 4.5-6 × 3.2-4.1 μm.

Figures

Figure 1. Phylogeny of Bjerkandera and related species generated by maximum parsimony analysis, based on combined ITS and nLSU sequences. Bootstrap support for maximum parsimony (MP), maximum likelihood (ML), and Bayesian posterior probabilities: (BPP) ≥ 50 % (MP-BT), 50 % (ML-BS) and 0.90 (BPP) are given in relation to the branches.

Figure 4. Bjerkandera fulgida (holotype, Y. C. Dai 16107) A basidiomata B poroid surface detail C a dark line between tubes and context. Scale bars: 1 cm (A); 1 mm (B, C).

Figure 5. Microscopic structures of Bjerkandera fulgida (holotype, Y. C. Dai 16107) a basidiospores b basidia and basidioles c hyphae from trama d hyphae from context.