Auxarthron chinense Z.F. Zhang & L. Cai, sp. nov. 2020
Index Fungorum number: 556412；Facesoffungi number: FoF 08431
Holotype: CHINA, Guangxi, Guilin, Luotian Cave, N 24.948°, E 110.524°, on soil, May 2016, Z.F. Zhang, HMAS 247999 (holotype designated here), ex-type living culture CGMCC3.19572 = LC12475; ibid., LC12477; ibid., LC12550; ibid., LC12580 (animal faeces); Guangxi, Guilin, E’gu Cave, N 24.942°, E 110.511°, on soil, May 2016, Z.F. Zhang, LC12473; ibid., LC12474; Yunnan, Mengzi, Mingjiu old Cave, N 23.487°, E 103.619°, on soil, May 2016, Z.F. Zhang, LC12463.
Morphological description
Hyphae hyaline, septate, branched, smooth, 1.5–3.5 μm wide, sometimes swollen, up to 10.0 μm wide; racquet hyphae present, ‘racquet’ 4–5 μm wide. Asexual morph Conidia arthroconidial, abundant, mostly intercalary, few lateral and terminal, unicellular, cylindrical, ellipsoidal or clavate with one or two truncated bases, smooth, hyaline, 4.0–7.0 (–8.0) × 2.0–3.5 µm ( x̄ ± SD = 5.3 ± 0.92 × 2.6 ± 0.25 µm, n = 50), frequently separated by 1–3 autolytic connective cells. Sexual morph not observed.
Culture characteristics—Colonies on PDA 18–23 mm diam. after 4 weeks, flat, annular, margin dentate, cottony and white at center, pulverulent to felty and light yellow (1A2) at margin. Reverse orange (5A5) to pale orange (4A5). Colonies on OA 18–23 mm diam. after 4 weeks, flat, pulverulent, margin unclear, white, aerial mycelia sparse. Reverse beige (28A3). Colonies on SNA 21–25 mm diam. after 4 weeks, flat, powdery, margin crenate, cream-yellow. Reverse cream-yellow (1A2) to white. Sporulation within 3 weeks.
Habitat: on soil.
Distribution: Guangxi, Guilin, Luotian Cave, China.
GenBank Accession:
Notes: Morphological and phylogenetic data (Figs. 15, 16) support our strains as new species of Auxarthron. Auxarthron chinense is phylogenetically closely related to A. alboluteum Sigler, Hambl. & Flis, A. compactum G.F. Orr & Plunkett and A. zuffianum (Morini) G.F. Orr & Kuehn (Fig. 15). However, A. chinense can be distinguished from A. alboluteum by less lateral and terminal conidia; from A. compactum by the hyaline conidia rather than pale yellow of A. compactum; from A. zuffianum by wider conidia (2.0–3.5 µm vs. 1.2–1.6 µm).
Reference: Zhi‑Feng Zhang ,Shi‑Yue Zhou ,Lily Eurwilaichitret al.
Auxarthron chinense (from ex-holotype CGMCC3.19572). a–c Upper and reverse views of cultures on PDA, OA and SNA 4 weeks after inoculation; d–g arthroconidia; h racquet hyphae; i swollen hyphae. Scale bars: d–i 10 μm
