Fungalpedia – Note 3100, Pseudohelicosporium
Pseudohelicosporium J. Ma, K.D. Hyde & Y.Z. Lu.
Citation when using this data: Jian Ma et al. 2024 – Fungalpedia.
Index Fungorum, Faceoffungi, MycoBank, GenBank, Fig 1.
Classification: Tubeufiaceae, Tubeufiales, Incertae sedis, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi.
Etymology: “Pseudohelicosporium” refers to the morphology of this genus similar to the asexual morph of Helicosporium.
Saprobic on decaying wood in a terrestrial habitat. Sexual morph Undetermined. Asexual morph Hyphomycetous, helicosporous. Colonies on natural substrate superficial, effuse, gregarious, with masses of crowded, glistening conidia, green. Mycelium partly immersed, partly superficial, composed of hyaline to pale brown, branched, septate, guttulate, smooth hyphae. Conidiophores macronematous, mononematous, arising from creeping hyphae, erect, irregular cylindrical, short, flexuous, branched or unbranched, aseptate, hyaline to pale brown, smooth-walled. Conidiogenous cells holoblastic, monoblastic or polyblastic, integrated, sympodial, terminal, irregular cylindrical or ampulliform, with tiny tooth-like protrusions, truncate at apex after conidial secession, hyaline, smooth-walled. Conidia solitary, acrogenous, helicoid, tapering towards the rounded ends, developing on tooth-like protrusion, becoming loosely coiled in water, multi-septate, slightly constricted at septa, guttulate, hyaline, smooth-walled.
Notes: The conidia of Pseudohelicosporium are similar to those of Helicosporium but phylogenetically distinct within Tubeufiaceae (Fig. 4; Ma J et al. 2024). Pseudohelicosporium irregulare and Ps. laxisporum have different conidiophore morphologies. Herein, we introduce a new genus, Pseudohelicosporium, to accommodate Ps. irregulare and Ps. laxisporum based on their molecular data and conidial morphology.
Type species: Pseudohelicosporium irregulare J. Ma, K.D. Hyde & Y.Z. Lu, sp. nov.
Other accepted species: Species Fungorum – search Pseudohelicosporium.
Figure 1 – Pseudohelicosporium irregulare (HKAS 128962, holotype). a, b Colonies on decaying wood. c–h Conidiophores and conidiogenous cells. i–l Conidia. m, n Colonies on PDA from above and below. Scale bars: c, d = 20 µm, i–l = 10 µm, e–h = 5 µm.
References
Entry by
Jian Ma, School of Food and Pharmaceutical Engineering, Guizhou Institute of Technology, Guiyang 550003, P.R. China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand.
Published online 3 September 2026