Pleosporales » Macrodiplodiopsidaceae » Pseudochaetosphaeronema

Pseudochaetosphaeronema pandanicola

Pseudochaetosphaeronema pandanicola Tibpromma & K.D. Hyde, in Fungal Diversity 92: 53 (2018),

Index Fungorum number: IF554501         Facesoffungi number: FoF04511


Sexual morph: Undetermined. Asexual morph: Conidiomata 100–110 × 156–167 μm ( = 107 × 161 μm, n = 5), scattered to gregarious, superfificial, flflat on the base, conspicuous on host surface, dark brown, shiny, solitary, uniloculate, globose to subglobose, without papilla and ostiole. Pycnidial wall 11–18 μm, composed of several layers of thick-walled, dark brown cells of textura prismatica.  Conidiogenous cells 8–17 × 1–3 μm ( = 11 × 2 μm, n = 20), monophialidic, cylindrical, thick-walled, smooth, each with a small collarette at the tip. Conidia 2–5 9 1.5–3 μm ( = 3 × 2 μm, n = 30), subglobose to oval, aseptate, hyaline to subhyaline, guttulate without mucilaginous sheath.

Culture characteristics: Conidia germinating on MEA within 12 h. Colonies on MEA, grey on the surface, with dense, circular, with entire edge, raised, velvety, brown in reverse, with smooth margin. Sporulating in MEA after 3 months.

Material examined: THAILAND, Prachuap Khiri Khan Province, Bang Saphan District, Sai Khu Waterfall, on Pandanus sp., 30 July 2015, S. Tibpromma SF15-040 (MFLU 18-0016, holotype; HKAS 100842, isotype); extype living culture, MFLUCC 16-0272 = KUMCC 17-0308.

GenBank numbers LSU: MH260316; ITS: MH275082; SSU: MH260356.


Notes: In the phylogenetic analysis, Pseudochaetosphaeronema pandanicola clustered with P. martinelli S.A. Ahmed, Desbois, Miossec, Atoche, Bonifaz, & de Hoog. but was well-separated with high bootstrap support of 99% in ML and 1 in BYPP. Pseudochaetosphaeronema martinelli is a human pathogen and hyphae are present in culture (Ahmed et al. 2015a). According to Ahmed et al. (2015a) some Pseudochaetosphaeronema species can produce coelomycetous fruit bodies after extended incubation. Our taxon produced conidia in culture. Based on molecular phylogeny, P. pandanicola is described here as a new species. In a BLASTn search on NCBI GenBank, the closest matches of ITS sequence of MFLUCC 16-0272 is P. martinelli with 96% identity to the strain JP105B-2X (MG649295).

Figure X. Pseudochaetosphaeronema pandanicola (MFLU 18-0016, holotype). a Appearance of ascomata on host substrate. b Section of conidioma. c Section of pycnidial wall. d, e Conidiogenous cell producing conidia. f Conidia. g Germinating conidium. h, i Colony on MEA from above and below. j, k Mycelium formed in culture. l Conidia formed in culture. Scale bars: a = 200 μm, b = 50 μm, c, d–g, j = 5 μm, k, l = 20 μm

Reference: Tibpromma S, Hyde KD, Bhat JD, Mortimer PE, Xu JC, Promputtha I, Doilom M, Yang JB, Tang AMC, Karunarathna SC (2018) Identification of endophytic fungi from leaves of Pandanaceae based on their morphotypes and DNA sequence data from southern Thailand. MycoKeys. 33:25-67.




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