Calonectria aconidialis L. Lombard, Crous & S.F. Chen bis, Stud. Mycol. 80: 162 (2015) Fig. 1
MycoBank number: MB 809043; Index Fungorum number: IF 809043; Facesoffungi number: FoF 11338;
Micromorphology: Associated with stem rot of Arachis hypogaea. Telemorph: Perithecia 290–600 × 240–480 µm, solitary, orange-red, subglobose, perithecial walls rough. Asci fusiform with 8-spored. Ascospores (32–)37–40(–46) × (5–)6–8(–9) µm (x̄ = 38.5 × 6.5 µm, n=50), hyaline, fusoid, straight to curved, 1-septate, sometimes constricted at septum. Anamorph: Macroconidiophores 15–25 × 4–6 μm septate, hyaline. Primary branches of conidiogenous apparatus; secondary branches aseptate, 10–20 × 4–6 μm; tertiary branches 10–15 × 3–6 μm; each terminal branch producing 2–4 phialides, 10–15 × 3–6 μm. Macroconidia (44–)48–50(–55) × 4–7(–8) μm (x̄ = 49.5 × 7 μm, n=50), cylindrical, straight, 1 septate. Megaconidia and microconidia not observed.
Culture characteristics: Colonies on MEA fast growing at 25 ℃, growth rate 11 mm/d (n = 5), circular, producing abundant white aerial mycelium; reverse orange.
Material examined: China, Guangdong province, Shaoguan city, Arachis hypogaea Linn., (Fabaceae), 27th September 2019, C.T. Chen (dried culture ZHKU 21-0028), and living culture, ZHKUCC 21-0031.
Notes: One isolate from this study clustered with Ca. aconidialis in the multigene phylogeny with 63 % ML, 70 % MP and 0.97 BYPP values. Morphologically our isolate is similar to Ca. aconidialis as described by Lombard et al.(2015). However, Mega, macro and microconidia were not observed in Lombard et al. (2015), while our isolates produce macroconidia. To our knowledge, this is the first report of Ca. aconidialis from Arachis hypogaea.
Figure 1. Calonectria aconidialis (ZHKUCC 21-0031: New host record) a–b: Culture characteristics on MEA after 7 days (a, upper view; b, reverse view); c: Ascomata; d: Vertical section through an ascoma; e: A ascus; f–h: Ascospores; i–j: Conidiogenous apparatus; k–m: Macroconidia; Scale bars: c = 100 μm; d = 50 μm; e–m = 10 μm.