Pleosporales » Macrodiplodiopsidaceae » Pseudochaetosphaeronema

Pseudochaetosphaeronema kunmingense

Pseudochaetosphaeronema kunmingense D.P. Wei, Wanas. & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 75 (2020)

Index Fungorum number: IF557019         Facesoffungi number: FoF07078

 

Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata 180–250 μm diam. (x̄

= 221 μm, n = 5), pycnidial, erumpent to superficial, globose to subglobose scattered, black, glabrous,

solitary, uni-loculate, without papilla. Pycnidial walls 15–50 μm (x̄ = 30 μm, n = 30), outer layers comprised of thick-walled, brown cells of textura angularis, inner layers comprised of hyaline, thin-walled cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 3–9 × 1–2.5 μm (x̄ = 6 × 1.3 μm, n = 20), produced from inner stromatic tissue, monophialidic, cylindrical or ampulliform, integrated, hyaline, smooth-walled. Conidia 10–15 × 4–6 μm (x̄ = 13 × 5 μm, n = 50), hyaline when immature, becoming brown at maturity, typically fusiform with round ends, occasionally oval, smooth-walled, 3-septate, slightly constricted at the septa

 

Culture characteristics: Conidia germinating on WA and germ tubes produced from conidium within 24 h. Colonies growing on PDA, circular, with flat surface, edge entire, cotton, reaching 20 mm diam. in 10 days at 25 °C, gray upper and reverse view with pale gray margin on PDA medium.

 

Material examined: CHINA, Yunnan Province, Kunming City, Kunming Institute of Botany, on decaying twig of Cerasus pseudocerasus (Lindl.) Loudon (Rosaceae), 19 August 2018, D.P. Wei, KIB1902 (KUN-HKAS 102564, holotype), ex-type living culture, KUMCC 19-0215.

 

GenBank Accession No: ITS: MN792812, LSU: MN792815, SSU: MN792814, TEF1-α = MN794017.

 

Notes: In the concatenated gene analyses, Pseudochaetosphaeronema kunmingense shows a close phylogenetic affinity to P. siamensis Jayasiri, E.B.G. Jones & K.D. Hyde (MFULCC 17-2287) with strong support (100% ML, 1.00 BYPP). Morphologically, P. kunmingense is similar to P. siamensis in having dark brown, uni-loculate, globose to subglobose, glabrous perithecia, monophialidic, cylindrical

conidiogenous cells and gray to brown colonies. But it differs from P. siamensis in conidial morphology with P. kunmingense having septate, fusiform, yellow-brown, conidia and P. siamensis in having hyaline to subhyaline, subglobose to oval, aseptate conidia (Jayasiri et al. 2019). The comparison of ITS sequences between P. kunmingense (KUN-HKAS 102564) and P. siamensis (MFULCC 17-2287) shows 37 bp differences (6%) within 510 bp. Thus, we introduce our isolates as a new species according to the guidelines of Jeewon and Hyde (2016).

Figure X. Pseudochaetosphaeronema kunmingense (KUN-HKAS 102564, holotype). a Substrate (twig). b, c Conidiomata on substrate. d Vertical section of conidioma. e Pycnidial wall. f–i Conidiogenous cells bearing conidia. j, k Colony on PDA from above and below. l–o Conidia. p Germinating conidium. Scale bars: b = 500 μm, c = 200 μm, d = 50 μm, e, f, p = 20 μm, l–o = 10 μm, g–i = 5 μm.

Reference:

: Hyde KD, Dong Y, Phookamsak R, Jeewon R et al. (2020) Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Diversity (2020) 100:5–277.

 

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