Biscogniauxia effusa 2020

Biscogniauxia effusa Q.R. Li, J.C. Kang & K.D. Hyde, sp. nov. 2020

Index Fungorum number: IF551308; Facesoffungi number: FoF: 00875

Holotype: CHINA, Hainan Province, Sanya City, Jianfengling National Nature Reserve, on dead bark of unknown plant, March, 2015, Q.R. Li (GZUH0122, holotype); ex-type living culture, GZUCC0122.

Morphological description

Saprobic on dead bark. Sexual morph: Stromata more than 5 cm long and 3 cm diam., widely effuse, crust-like, flat or slightly undulate, black, bipartite, confluent, without raised margins, ascomatal mounds, with black ostioles. Ascomata 180–230 μm high, 320–450 μm diam. (x = 210×390 μm, n=10), solitary, obovoid, black, carbonaceous, immersed, encasing a single ascoma, in vertical section, globose to subglobose, ostiolate. Peridium 40–60 μm wide, black. Paraphyses not seen. Asci spore-bearing part 170–200×12–14 μm (x = 190×13 μm, n=30), 8-spored, unitunicate, cylindrical, stipes 25–30 μm long, apically rounded, with a J+, tubular, 7–8 μm high, 5–6 μm wide apical apparatus. Ascospores 25–31×8–10 μm (x = 28× 9 μm, n=30), uniseriate, light brown, unicellular, equilateral ellipsoidal, with broadly rounded ends, smooth-walled, with a full length, straight, germ slit. Asexual morph: Undetermined.Culture characteristics: Colonies growing slowly on PDA, reaching 2 cm diam. after 2 weeks at 25 °C, brown, black in reverse side, cottony, flat, low, dense, with slightly wavy margin.

Habitat: on dead bark of unknown plant 

Distribution: China

GenBank Accession: 

Notes: Biscogniauxia effusa has flattened stromata and is similar to B. atropunctata (Schwein.: Fr.) Pouzar. and B. weldenii (J.D. Rogers) Whalley & Læssøe in ascospore size (Ju et al. 1998). Biscogniauxia atropunctata differs in having 16–22×7.5–11 μm, ellipsoid ascospores, with straight germ slits, and shorter 150–170 μm asci with a J+, discoid, apical apparatus (Ju et al. 1998). Biscogniauxia weldenii differs in having 25–28×9.5–10.5 μm ascospores ornamented with striations and with an appendage (Ju et al. 1998). Biscogniauxia effusa groups with B. marginata (Fr.) Pouzar and B. arima F. San Martín et al. and forms a well-supported monophyletic clade in the Xylariaceae with 93 % bootstrap support.

Reference: Hiran A. Ariyawansa^1,3 & Kevin D. Hyde^1,2,3,15 & Subashini C. Jayasiri^1,3 et al.

Biscogniauxia effusa (holotype) a Herbarium sample b Stroma on the surface of host c Surface of stroma cut away to reveal ascomata d, e