Setoseptoria

Fungalpedia – Note 2445, Setoseptoria

Setoseptoria. Quaedvl., Verkley & Crous.

Citation when using this data: Dong W et al. 2020 – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1

Classification: Lentitheciaceae, Pleosporales, Pleosporomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi

Saprobic on decaying leaves or wood/branch in terrestrial or submerged wood in fershwater habitats. Sexual morph: Ascomata erumpent to superficial, scattered to gregarious, sometimes scattered beneath the host periderm or on decorticated wood, subglobose to hemispherical with flattened base, glabrous, sometimes with sparse brown hyphae at sides, dark brown to black, with a central ostiole, with or without short papilla. Peridium thin, composed of several layers of thin-walled cells. Pseudoparaphyses numerous, cellular, hyaline, septate, branched, persistent, anastomosing between and above the asci. Asci 8-spored, bitunicate, fissitunicate, clavate to cylindric-clavate, or narrowly ovoid, pedicellate, rounded at the apex, with an indistinct or minute ocular chamber. Ascospores uni- to tri-seriate, cylindrical to narrowly fusiform, mostly hyaline, sometimes hyaline to pale olivaceous, septate, deeply constricted at the primary septum, mostly asymmetrical, smooth, thin-walled, surrounded by a gelatinous sheath (Tanaka et al. 2004; Hyde et al. 2017; Wanasinghe et al. 2018b). Asexual morph: Coelomycetous. Pycnidia immersed, uniloculate, globose, with brown, verruculose to warty setae, brown, ostiolate, somewhat papillate. Peridium composed of several layers of brown, angular cells which inwardly become hyaline. Conidiophores reduced to conidiogenous cells or with one supporting cell. Conidiogenous cells subcylindrical to doliiform, hyaline, smooth, apical region with several inconspicuous percurrent proliferations, or with periclinal thickening; collarette inconspicuous, or prominent, flared. Conidia subcylindrical, straight to somewhat curved, hyaline, smooth, transversely septate, thin-walled, without appendages or sheath (Quaedvlieg et al. 2013).

Notes: Setoseptoria was introduced for a coelomycetous species S. phragmitis which forms setose pycnidia and subcylindrical, (1–)3-septate, hyaline conidia that become olivaceous and verruculose in older cultures (Quaedvlieg et al. 2013). Another six ascomycetous species were added to the genus, but the asexual morphs were not produced in culture but lack strong bootstrap support between each other (Hyde et al. 2017; Wanasinghe et al. 2018b). Tanaka et al. (2015) mentioned that the species producing both sexual and asexual morphs were needed to confirm the validity of this generic treatment.

Setoseptoria arundinacea (Sowerby) Kaz. Tanaka & K. Hiray., a common species occurring on Phragmites culms, was also reported from freshwater habitats (Aptroot 1998; Tanaka and Harada 2003c; Luo et al. 2004; Zhang et al. 2009d). Setoseptoria arundinacea may consist of several cryptic species because two strains, KT 552 and KT 600 (Tanaka et al. 2015), did not form a clade with another two strains CBS 619.86 (Schoch et al. 2009) and CBS 123131 (Zhang et al. 2009c), which showed in Tanaka et al. (2015), Hyde et al. (2017), Wanasinghe et al. (2018b). The epitype of this species is expected to solve this S. arundinacea complex. The second freshwater species S. magniarundinacea (Kaz. Tanaka & Y. Harada) Kaz. Tanaka & K. Hiray. has larger ascospores than S. arundinacea (Tanaka et al. 2004)

Type species: Setoseptoria phragmitis Quaedvl., Verkley & Crous.

Other accepted species: Species Fungorum – search Setoseptoria.

Figure 1 – Setoseptoria spp. (Material examined: JAPAN, Aomori, Hirosaki, Kadoke, Oowasawa-river, on dead culms of Phragmites australis, 29 July 2001, K. Tanaka, KT 600 = HHUF 27544; Hokkaido, Akkeshi, Ariake, small stream, on submerged stems of herbaceous plant, 3 June 2003, K. Tanaka & S. Hatakeyama, KT 1174 = HHUF 28293, holotype). a–e S. arundinacea (KT 600 = HHUF 27544). a Ascomata on the host surface. b, c Section of ascomata. d Ascus. e Ascospore. f, g Ascospores of S. magniarundinacea (culture of KT 1174 = CBS 139702). Scale bars: a = 1 mm, b = 500 μm, c = 100 µm, d–g = 10 μm

References

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Entry by

Wei Dong, Faculty of Agriculture and Food, Kunming University of Science and Technology, Kunming 650500, China, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Institute of Plant Health, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou 510225, China

Published online 22 May 2026

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