Pleosporales » Phaeoseptaceae


Phaeoseptum Ying Zhang, J. Fourn. & K.D. Hyde

Index Fungorum number: IF 561889; Facesoffungi number: FoF 08326


Saprobic on submerged branch or dead stems. Sexual morph: Ascomata solitary, scattered to gregarious, sometimes immersed under pseudoclypeus, erumpent when mature, appearing as black, elongate regions on host surface, depressed globose, sometimes covered with some brown hyphae, dark brown, with ostiolate papilla. Peridium pseudoparenchymatous, comprising several layers of somewhat flattened cells of textura angularis. Pseudoparaphyses numerous, cellular, narrow, hyaline, cylindrical, septate, anastomosing. Asci 8-spored, bitunicate, cylindrical-clavate, pedicellate, with a small ocular chamber and apical ring. Ascospores uni- to tri-seriate, fusiform, slightly curved, transversally septate, with a vertical septum in nearly all cells, sometimes with a Y-shaped septum in the end cell, pale brown to brown, with thickened and darkened septa at maturity, smooth- or rough-walled, without sheath or appendages. Asexual morph: Undetermined. (Descriptions from Dong et al. 2020)


Type species: Phaeoseptum aquaticum Ying Zhang, J. Fourn. & K.D. Hyde


Notes: Phaeoseptum was introduced by Zhang et al. (2013) to accommodate the freshwater species P. aquaticum collected from France. Phaeoseptum was placed in Halotthiaceae based on LSU sequence data (Zhang et al. 2013). With more sequence data added, Phaeoseptum was transferred to Phaeoseptaceae (Hyde et al. 2018). The type species P. aquaticum is characterized by ascomata fully immersed under a small blackened pseudoclypeus, cylindrical-clavate asci with a small ocular chamber and an apical ring, and fusiform ascospores with transverse and longitudinal septa, exceptionally with a Y-shaped septum in the end cell (Zhang et al. 2013).


List of freshwater Phaeoseptum species

Phaeoseptum aquaticum Ying Zhang, J. Fourn. & K.D. Hyde, Mycologia 105(3): 606 (2013)

Freshwater distribution: France (Zhang et al. 2013)



Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu X-D, Wang G-N, Yang H, Yang J, Thambugala KM, Tian Q, Luo Z-L, Yang J-B, Miller AN, Fournier J, Boonmee S, Hu D-M, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575.

Hyde KD, Chaiwan N, Norphanphoun C, Boonmee S, Camporesi E, Chethana KWT, Dayarathne MC, de Silva NI, Dissanayake AJ, Ekanayaka AH, Hongsanan S, Huang SK, Jayasiri SC, Jayawardena RS, Jiang HB, Karunarathna A, Lin CG, Liu JK, Liu NG, Lu YZ, Luo ZL, Maharachchimbura SSN, Manawasinghe IS, Pem D, Perera RH, Phukhamsakda C, Samarakoon MC, Senwanna C, Shang QJ, Tennakoon DS, Thambugala KM, Tibpromma S, Wanasinghe DN, Xiao YP, Yang J, Zeng XY, Zhang JF, Zhang SN, Bulgakov TS, Bhat DJ, Cheewangkoon R, Goh TK, Jones EBG, Kang JC, Jeewon R, Liu ZY, Lumyong S, Kuo CH, McKenzie EHC, Wen TC, Yan JY, Zhao Q (2018) Mycosphere notes 169–224. Mycosphere 9:271–430

Zhang Y, Fournier J, Phookamsak R, Bahkali AH, Hyde KD (2013) Halotthiaceae fam. nov. (Pleosporales) accommodates the new genus Phaeoseptum and several other aquatic genera. Mycologia 105:603–609


About Freshwater Fungi

The webpage Freshwater Fungi provides an up-to-date classification and account of all genera of freshwater fungi.


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