Auxarthronopsis globiasca Z.F. Zhang & L. Cai, sp. nov. 2020
Index Fungorum number: 556414；Facesoffungi number: FoF 08433
Holotype: CHINA, Guangxi, Guilin, Luotian Cave, N 24.948°, E 110.524°, on soil, May 2016, Z.F. Zhang, HMAS 247994 (holotype designated here), ex-type living culture CGMCC3.19305 = LC12472; Guangxi, Guilin, E’gu Cave, N 24.942°, E 110.511°, on soil, May 2016, Z.F. Zhang, LC12667.
Morphological description
Hyphae hyaline, septate, branched, smooth, 1.5–3.0 μm diam., sometimes cross connected, racquet hyphae present, up to 6 μm wide. Sexual morph Ascomata abundant, solitary or in clusters, surface powdery, subglobose to globose, pale yellow, 270–450 μm diam. Peridial hyphae septate, rough, thick-walled, pale brown, branched and anastomosed to form a reticuloperidium, terminated by short blunt prominences, 1.5–3.0 μm diam. Asci 8-spored, subglobose or globose, hyaline, 5.5–8.0 × 5.5–7.5 µm. Ascospores oblate, ellipsoidal, subglobose or globose in front view, smooth, hyaline, 2.5–3.5 × 2.0–3.0 µm ( x̄ ± SD = 2.9 ± 0.21 ×2.0 ± 0.24 µm, n = 50). Asexual morph Arthroconidia presented, abundant, mostly intercalary, few terminal and lateral, unicellular, cylindrical, ellipsoidal or clavate with truncated base, smooth, hyaline, 3.5–6.5 × 2.0–3.5 µm ( x̄ ± SD = 4.8 ± 0.73 × 2.7 ± 0.34 µm, n = 50), frequently separated by 1–3 autolytic connective cells. Culture characteristics—Colonies on PDA attaining 31–36 mm diam. after 4 weeks, flat, felty, annular, margin fimbriate, seashell (5A2) to light yellow (4A3) from margin to center. Reverse cream-yellow (4A2) to orange at margin, brown (6D8) at middle, black (6F1) at center. Colonies on OA attaining 46–48 mm diam. after 4 weeks, flat, beige (4A1), aerial mycelia extremely sparse. Reverse beige (3A2). Colonies on SNA attaining 23–30 mm diam. after 4 weeks, margin rhizoids, aerial mycelia sparse, with floralwhite (30A2) ascomata scattered. Reverse ivory. Sporulation within 25 days on SNA.
Habitat: on soil.
Distribution: Guangxi, Guilin, Luotian Cave, China.
GenBank Accession:
Notes: Our strains form a well supported distinct clade with Auxarthronopsis species (Fig. 15). Auxarthronopsis globiasca is phylogenetically allied with A. bandhavgarhensis, A. guizhouensis and A. pedicellaris. Ascomata of A. bandhavgarhensis are white and much larger than those of A. globiasca (500–1000 µm vs. 270–450 μm). A. globiasca differs from A. guizhouensis by the presence of asexual morph. In contrast to A. globiasca, conidia of A. pedicellaris are lateral or terminal.
Reference: Zhi‑Feng Zhang ,Shi‑Yue Zhou ,Lily Eurwilaichitret al.
Auxarthronopsis globiasca (from ex-holotype hyphae; f–i asci; j ascospores; k–m arthroconidia; n racquet hyphae; CGMCC3.19305). a–c Upper and reverse views of cultures on PDA, o connected hyphae. Scale bars: e–o 10 μm OA and SNA 4 weeks after inoculation; d ascomata; e peridial
