Onygenales » Onygenaceae » Auxarthron

Auxarthron guangxiense

Auxarthron guangxiense Z.F. Zhang & L. Cai, sp. nov.

Index Fungorum number: 556413, Facesofungi number: FoF 08432; Fig. 17

Etymology: Referring to the province where the type strain was isolated.

Holotype: HMAS 247993.

Hyphae hyaline, septate, branched, smooth, 1.5–2.5 μm diam. Sexual morph Ascomata abundant, solitary or in clusters, subglobose to globose, white at frst, becoming orange-brown at maturity, 250–380 μm diam. Peridial hyphae rough, thick-walled, septate, pale brown, branched and anastomosed to form a reticuloperidium, terminated by spine-like or blunt prominences, sometimes dichotomously branched, 1.5–2.5 μm diam, appendages not observed. Asci 8-spored, pyriform, subglobose or globose, hyaline, 8.5–12.0 × 6.5–9.0 µm. Ascospores oblate, smooth, hyaline, 2.5–3.5 µm (x̄ ± SD = 3.1 ± 0.22 µm, n = 40). Asexual morph not observed. Culture characteristics—Colonies on PDA attaining 26–31 mm diam. after 4 weeks, fat, margin crenate, cottony, cream-white (2A1) to yellow (2A3) at fruiting region, foralwhite at aging region. Reverse pale yellow (1A2) to goldenrod (2A3) at margin, dark brown (4D8) at center. Colonies on OA attaining 32–40 mm diam. after 4 weeks, fat, annular, cottony at middle, white to pale yellow (2A3) from margin to center. Reverse pale yellow (2A3).

Colonies on SNA attaining 28–32 mm diam. after 4 weeks, fat, white to pale yellow (1B3), aerial mycelia sparse, with ascomata scattered. Reverse white to pale yellow (1B3). Sporulation within 3 weeks on SNA.

Material examined: CHINA, Guangxi, Guilin, E’gu Cave, N 24.942°, E 110.511°, on soil, May 2016, Z.F. Zhang, HMAS 247993 (holotype designated here), ex-type living culture CGMCC3.19634 = LC12464; ibid., LC12465.

Notes: Phylogenetically, Auxarthron guangxiense is close to A. pseudauxarthron G.F. Orr & Kuehn, but differs in the absence of ascomatal appendages.

 

Fig. X Auxarthron guangxiense (from ex-holotype CGMCC3.19634). a–c Upper and reverse views of cultures on PDA, OA and SNA 4 weeks after inoculation; d ascomata; e, f peridial hyphae; g–i asci; j ascospores. Scale bars: e 50 μm; f 20 μm; g–j 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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