Onygenales » Onygenaceae » Auxarthronopsis

Auxarthronopsis globiasca

Auxarthronopsis globiasca Z.F. Zhang & L. Cai, sp. nov.

Index Fungorum number: 556414, Facesofungi number: FoF 08433; Fig. 18 Etymology: Referring to its globose asci. Holotype: HMAS 247994. 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, fat, felty, annular, margin fmbriate, 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, fat, 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 foralwhite (30A2) ascomata scattered. Reverse ivory. Sporulation within 25 days on SNA.

Material examined: 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.

Notes: Our strains form a wellsupported 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 difers from A. guizhouensis by the presence of asexual morph. In contrast to A. globiasca, conidia of A. pedicellaris are lateral or terminal.

 

Fig. X Auxarthronopsis globiasca (from ex-holotype CGMCC3.19305). a–c Upper and reverse views of cultures on PDA, OA and SNA 4 weeks after inoculation; d ascomata; e peridial hyphae; f–i asci; j ascospores; k–m arthroconidia; n racquet hyphae; o connected hyphae. Scale bars: e–o 10 μm

 

Retrieved from:

Kandemir H, Dukik K, de Melo Teixeira M, Stielow JB et al.  2022 –  Phylogenetic and ecological reevaluation of the order Onygenales. Fungal Diversity, 1-72. https://doi.org/10.1007/s13225-022-00506-z

 

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