Camporesiomyces mali

Camporesiomyces mali D.P. Wei & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 139 (2020)

Index Fungorum number: IF557016         Facesoffungi number: FoF 07075

Sexual morph: Ascomata 200–300 μm (x̄ = 231 μm, n = 5), subimmersed, scattered, black, nearly globose, multi-loculate, ostiolate, setaceous. Setae 15–20 × 1–2 μm (x̄ = 17 × 1.5 μm, n = 5), short, dark brown to black, aseptate, attenuated toward the apex. Peridium 15–50 μm (x̄ = 23 μm, n = 20), comprising dark brown to pale-brown, irregular in thickness, thin-walled cells of textura angularis. Hamathecium comprising inconspicuous, filiform, hyaline pseudoparaphyses. Asci 50–100 × 10–25 μm (x̄ = 70 × 14 μm, n = 10), 8-spored, bitunicate, broadly clavate, thickened at apex, without ocular chamber. Ascospores 50–75 × 3–5 μm (x̄ = 62 × 4 μm, n = 30), hyaline, cylindrical, slightly curved, 10–12-septate, ends remaining cone-shaped, smooth-walled, guttulate when young. Asexual morph: Undetermined.

Culture characteristics: Culture was obtained from germinated ascospores. Colonies slowly growing on PDA, brown, slightly raised, dense, with irregular margin, reaching 2 mm in 9 days at 25 °C.

Host and habitat: on decaying branches of Malus halliana Koehne. (Hyde et al. 2020)

Known distribution: China

Material examined: CHINA, Yunnan Province, Kunming City, Kunming Institute of Botany, on decaying wood branches of Malus halliana (Rosaceae), 19 August 2018, D.P. Wei, KIB1903 (KUN-HKAS 102565, holotype), ex-type living culture, KUMCC 19-0216.

GenBank Accession No: ITS: MN792813, LSU: MN792811, TEF1-α: MN794018.

Notes: The new isolate has close affinity with Acanthostigma patagonicum (BBB MVB 573) and Helicoma vaccinii (CBS 216.90) by forming a distinct, strongly supported clade as basal to the remaining taxa in Helicosporium (100% ML). The new isolate resembles A. patagonicum in having dark brown setae, clavate asci and inconspicuous pseudoparaphyses. But new isolate can be distinguished from A. patagonicum in having narrowly fusiform, symmetric ascospores, in contrast to elongate fusiform ascospores, with asymmetrical ends in A. patagonicum (Sanchez et al. 2012). Helicosporium vaccinii is only known from its asexual morph (Carris 1989). A comparison of ITS sequences between our isolate and A. patagonicum show 24 bp difference and 3 gaps within 330 bp nucleotides. When ITS sequences are compared with H. vaccinii, there are 52 bp difference and 17 gaps within 504 bp nucleotides. Thereby, we determined our isolate to be a novel species in the new genus Camporesiomyces.