Pleosporales » Phaeosphaeriaceae

Neosetophoma

Neosetophoma Gruyter, Aveskamp & Verkley, in de Gruyter, Woudenberg, Aveskamp, Verkley, Groenewald & Crous, Mycologia 102(5): 1075 (2010)

= Septochora Höhn., Ber. dt. bot. Ges. 35(3): 254 (1917) Crous & M.J. Wingf., in Crous et al., Persoonia 35: 283 (2015)

Citation when using this entry, Chen C. et al. in prep. – An updated monograph of Coelomycetes, Mycosphere

Index Fungorum, Facesoffungi number, MycoBank, GenBank           

Classification: Phaeosphaeriaceae, Pleosporales, Dothideomycetes, Ascomycota, Fungi

Endophytic or saprobic on host plants. The sexual morph is characterised by ascomata which are dark brown to black, immersed to erumpent, discrete to integrated, globose to subglobose, or turbinate, small-walled and ostiolate. The peridium is constituted by dark brown to brown, or to reddish-brown, small and thick-walled cells of textura angularis or textura epidermoidea. The hamathecium is septate, filamentous, cellular pseudoparaphyses, and embedded in a gelatinous matrix. Asci are 8-spored, fissitunicate, bitunicate, short-pedicellate, cylindro-clavate to obclavate or clavate, apex rounded, and with an ocular chamber. Ascospores are 1–2-seriate, overlapping, 1–5-septate, constricted at the septum, hyaline when immature, pale brown at maturity, fusiform, straight or slightly curved, guttulate, smooth-walled (Hyde et al. 2018, 2020, Tennakoon et al. 2020, Thambugala et al. 2017, Tibpromma et al. 2017, Zhang et al. 2024). The asexual morph is characterized by the superficial to subperidermal pycnidial conidiomata, which are dark brown to black, separate, or confluent, unilocular and globose. The ostiole is single, circular, papillate or with a long neck, located in the centre. The pycnidial wall is composed of textura angularis with thick-walled, brown to dark-brown cells. Conidiophores are reduced to conidiogenous cells. Conidiogenous cells are phialidic, enteroblastic, determinate, discrete, doliiform to ampulliform, smooth-walled and hyaline. Conidia are slightly yellowish to pale brown, aseptate to septate, not or constricted at the septum, ellipsoidal to cylindrical, straight to slightly curved, guttulate or not (Gruyter et al. 2010, Liu et al. 2015, Wijayawardene et al. 2016).

Type species: Neosetophoma samarorum (Desm.) Gruyter et al. Mycologia 102(5): 1075 (2010)

Phoma samararum Desm., Pl. Crypt. Nord France, Edn 1 7: no. 349 (1828)

= Septochora samarorum (Desm.) Höhn., Ber. dt. bot. Ges. 35(3): 254 (1917)

= Phomopsis samarorum (Desm.) Höhn., Hedwigia 62: 87 (1920)

= Septoria samarorum (Desm.) Wollenw. & Hochapfel, Z. ParasitKde 8: 604 (1936)

= Diplodina samarorum (Desm.) Nevod., Fungi of the U.S.S.R. 1: no. 14 (1952)

= Stagonospora samarorum (Desm.) Boerema, Persoonia 6(1): 25 (1970)

= Phoma samarorum f. pteleae Oudem., Ned. kruidk. Archf, 3 sér. 2(3): 740 (1902)

Notes: Neosetophoma was introduced by de Gruyter et al. (2010) based on N. samarorum as the type species, which was found on Fraxinus excelsior. Neosetophoma samarorum has been reported as a pathogen causing leaf spots on various hosts (Phookamsak et al. 2014). Neosetophoma garethjonesii is the first report of the sexual morph of Neosetophoma which was introduced by Tibpromma et al. (2017). Subsequently, Hyde et al. (2018) also introduced three sexual morph species (N. guiyangensis, N. shoemaker and N. xingrensis). Zhang et al. (2024) introduced N. trachycarpi based on LSU, SSU, tef-1α and rpb2 sequences which also only have sexual morph. Currently, there are 25 species listed in Neosetophoma in Species Fungorum (August 2024). There are over 450 sequences available for Neosetophoma in GenBank (August 2024). The updated taxonomic treatment of this genus is Phaeosphaeriaceae, in Pleosporales (Dothideomycetes) (Wijayawardene et al. 2022)

For all accepted species: see Species Fungorum, and search Neosetophoma.