Bjerkandera ecuadorensis Y.C. Dai, Chao G. Wang & Vlasak, 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 ecuadorensis Y.C. Dai, Chao G. Wang & Vlasak sp. nov. Figs 2 , 3

Diagnosis.

Bjerkandera ecuadorensis is characterised by grey to dark-brown pore surface, tiny pores (7-9 per mm), and ellipsoid basidiospores measuring 3.9-4.5 × 2.7-3 μm.

Type.

Ecuador, Pichincha Province, volcan Pasochoa , 3300 m, VI. 2019, J. Vlasák Jr. JV 1906/C16-J (holotype in PRM, isotypes in JV and BJFC032992) .

Etymology.

Ecuadorensis (Lat.): referring to the species being found in Ecuador.

Basidiomata.

Annual, pileate, soft corky, without odor or taste when fresh, becoming corky when dry, projecting up to 4 cm, 5 cm wide and 1.3 mm thick at base. Pileal surface pinkish-buff to buff, glabrous, faintly zonate, margin blunt. Pore surface grey to dark-brown, becoming almost black when touched or bruised; sterile margin distinct, up to 2 mm wide; pores round to angular, 7-9 per mm; dissepiments thin, entire. Context buff-yellow, slightly fibrous to corky, up to 1 mm thick. Tubes concolorous with the pore surface and darker than context, corky, up to 0.3 mm long, and with a distinct dark line between tubes and context.

Hyphal structure.

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

Context.

Generative hyphae thick-walled with a wide lumen, occasionally branched, densely compacted, and more or less regularly arranged to loosely interwoven, up to 3.8-6 μm in diam.

Tubes.

Generative hyphae thin- to slightly thick-walled, rarely branched, subparallel along the tubes to loosely interwoven, 2.5-3.8 μm in diam. Cystidia and cystidioles absent. Basidia clavate to barrel-shaped, with four sterigmata and a basal clamp connection, 13-14.5 × 4.5-5.5 µm; basidioles of similar shape to basidia, but smaller.

Basidiospores.

Ellipsoid, hyaline, thin-walled, smooth, often with one or more guttules, CB-, IKI-, (3.8-)3.9-4.5 × 2.7-3 µm, L = 4.09 μm, W = 2.86 μm, Q = 1.43 (n = 30/1).

Remarks.

Bjerkandera ecuadorensis is characterised by grey to dark-brown pore surface, small pores (7-9 per mm), hyaline to yellowish-brown generative hyphae, and ellipsoid basidiospores measuring 3.9-4.5 × 2.7-3 μm. Morphologically, Bjerkandera ecuadorensis is similar to B. minispora in having pinkish-buff to buff pileal surface and round to angular pores (6-9 per mm), but the latter has buff-yellow pore surface and smaller basidiospores (3.1-4.2 × 2-2.8 μm). Bjerkandera adusta resembles B. ecuadorensis by having grey to dark-brown pore surface, distinct sterile margin, but the former has short-cylindric to subellipsoid and bigger basidiospores (4.5-6 × 2.5-3.5 μm, Ryvarden and Melo 2017).

Figures

Figure 2. Pileal surface and pore surface of Bjerkandera ecuadorensis (holotype, JV 1906 / C 16 - J). Scale bars: 4 mm.

Figure 3. Microscopic structures of Bjerkandera ecuadorensis (holotype, JV 1906 / C 16 - J) a basidiospores b basidia and basidioles c hyphae from trama d hyphae from context.