Bjerkandera resupinata 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 resupinata Y.C. Dai & Chao G. Wang sp. nov. Figs 8 , 9

Diagnosis.

Differs from other species of Bjerkandera by resupinate basidiomata.

Type.

Thailand. Chiang Rai, Doi Mae Salong , rotten angiosperm trunk, 22. VII. 2016, Y.C. Dai 16642 (holotype BJFC022752) .

Etymology.

Resupinata (Lat.): referring to the species having resupinate basidiomata.

Basidiomata.

Annual, resupinate, adnate, soft corky, without odor or taste when fresh, becoming corky when dry, up to 6 cm long, 2 cm wide, 0.5 mm thick at base. Pore surface pinkish buff to pale brownish when dry, becoming dark grey in bruised parts; sterile margin distinct, thinning out, somewhat incised, up to 3 mm wide; pores round to angular, 4-6 per mm; dissepiments thin, entire to lacerated. Subiculum pale cream, slightly fibrous to corky, up to 0.2 mm thick. Tubes concolorous with the pore surface, darker than the subiculum, corky, up to 0.3 mm long, with a distinct dark line between tubes and subiculum.

Hyphal structure.

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

Subiculum.

Generative hyphae thick-walled with a wide lumen, rarely branched, loosely interwoven, 4-5 μm in diam.

Tubes.

Generative hyphae thin- to slightly thick-walled, frequently branched, loosely interwoven, 2.7-3.8 μm in diam. Cystidia and cystidioles absent. Basidia clavate, with four sterigmata and a basal clamp connection, 14-16 × 5-6.5 μm; basidioles in shape similar to basidia, but smaller.

Basidiospores.

Ellipsoid to broadly ellipsoid, hyaline, thin-walled, smooth, CB-, IKI-, 4.5-6(-6.2) × 3.2-4.1(-4.2) µm, L = 5.23 μm, W = 3.71 μm, Q = 1.40-1.42 (n = 60/2).

Additional specimen (paratype) examined.

China. Yunnan Province, Tengchong County, Gaoligong Mts., fallen angiosperm branch, 24. X. 2009, B.K. Cui 8017 (BJFC006506).

Remarks.

Bjerkandera resupinata is characterised by resupinate basidiomata, pinkish buff to pale brownish pore surface, clavate basidia, and ellipsoid to broadly ellipsoid basidiospores measuring 4.5-6 × 3.2-4.1 µm. Ceriporiopsis umbrinescens (Murrill) Ryvarden and Bjerkandera resupinata have resupinate basidiomata, pale buff to brownish pore surface, similar sterile margin, a monomitic hyphal structure, and almost the same size of basidiospores, but C. umbrinescens has bigger pores (2-4 per mm), unchanged pore surface when touched, and a dark line absent between tubes and subiculum ( Murrill 1920; Domański 1963; Núñez and Ryvarden 2001; Zhao et al. 2015).

Additional specimens examined.

Bjerkandera adusta : China. Heilongjiang Province, Heihe, Shengshan Nature Reserve , Populus , 26. VIII. 2014, Y. C. Dai 14516 (BJFC017794); Yunnan Province, Yongde County, Daxueshan Nature Reserve , rotten Angiosperm stump, 27. VIII. 2015, Y. C. Dai 15665 (BJFC019769); Gansu Province, Tianshui, Fangmatan Forest Park, fallen branch of Populus , 08. VIII. 2015, Y. C. Dai 15495 (BJFC019600) . France. Lyons , Abies , 24. XI. 2012, Y. C. Dai 13201 (BJFC014065) . Finland, Helsinki, Tamisto Nature Reserve , Betula , 4. XI. 2011, Y. C. Dai 12640 (BJFC012222). B. albocinerea : USA. CT, CAES Valley Lab, Dead log, 13. XII. 2015, Y. C. Dai 16411 (BJFC020499). B. fumosa : China. Chongqing, Jinfoshan Forest Park, dead angiosperm tree, 1. XI. 2019, Y. C. Dai 21100 (BJFC032759); Beijing, Chinese Academy of Sciences , living tree of Diospyros , Y. C. Dai 21087 (BJFC032746); Sichuan Province, Xiaojin County, Jiajin Mts. , Hippophae , 17. X. 2012, B. K. Cui 10747 (BJFC013669) . Finland, Helsinki, Tamisto Nature Reserve , Populus , 6. XI. 2011, Y. C. Dai 12474B (BJFC012257). B. mikrofumosa : Costa Rica. Monteverde, J. Vlasák Jr. JV 1707/10J-1; JV 1707/10J-2. B. centroamericana : Costa Rica, Carara Nature Reserve , J. Vlasák JV 1704/97. B. atroalba : Brazil. Recife, Charles Darwin Ecological Reserve , on angiosperm stump, Y. C. Dai 17457 (BJFC024988). Ceriporiopsis carnegieae : USA, Virgin Islands, St. John , on hard wood, J. Vlasák Jr. JV 0409/27-J. Ceriporiopsis sp. : Costa Rica. Arenal Mts. , J. Vlasák Jr. JV 1512/13-J .

Figures

Figure 8. Bjerkandera resupinata (holotype, Y. C. Dai 16642) A basidiomata B poroid surface detail C a dark line between tubes and subiculum. Scale bars: 1 cm (A); 1 mm (B, C).

Figure 9. Microscopic structures of Bjerkandera resupinata (holotype, Y. C. Dai 16642) a basidiospores b basidia and basidioles c hyphae from trama d hyphae from subiculum.