Chaetosphaerella E. Müll. & C. Booth, Trans. Br. mycol. Soc. 58(1): 76 (1972)
Hypocreomycetidae, Coronophorales, Chaetosphaerellaceae, Chaetosphaerella
Saprobic on woody substrates in terrestrial habitats. Sexual morph: Ascomata dark brown or black, perithecial, closely gregarious, superficial, sitting on a subiculum, coriaceous, obpyriform, tuberculate or a little roughened, with a small papilla at the apex, with brown setae, collabent when arid, ostiolate. Subiculum thin, septate, brown to dark brown, branched with spiny hyphae. Peridium thick (20–70 μm), munk pores present, outer layer composed of dark brown to brown cells of textura angularis; inner layer composed of textura prismatica of none pigmented cells. Hamathecium composed of many, filiform paraphyses, frequently existing only in young ascomata. Asci 8-spored, clavate, long or short pedicellate, apical ring distinct or indistinct, evanescent, unitunicate. Ascospores 1–3-seriate or overlying, with brown median cells and hyaline end cells, cylindrical to oblong, a little curved, 3-septate, slightly limited or not limited in the center, middle cells may become a little inflated, smooth-walled. Asexual morph: Hyphomycetous. Conidiophores brown, mononematous, septate, branched, percurrent, with a terminal, ampulla. Conidiogenous cells holoblastic or enteroblastic, polyblastic, combined, terminal, smooth-walled. Conidia brown, elliptical, solitary, 3-septate, slightly limited in the middle, the central cells lengthier and darker than the end cells, occasionally with guttules. (adapted from Maharachchikumbura et al. 2016).
Type species: Chaetosphaerella phaeostroma (Durieu & Mont.) E. Müll. & C. Booth, Trans. Br. mycol. Soc. 58(1): 77 (1972)
Notes: Chaetosphaerella was introduced by Müller & Booth (1972) and included two species, C. phaeostroma and C. fusca. The type species C. phaeostroma, is characterized by black ascomata surrounded by a subiculum, with tuberculate or roughened perithecia, clavate asci and pigmented ascospores. Sivanesan (1976) and Varghese & Rao (1979) included C. fusispora and C. indica in Chaetosphaerella based on the characters, however, Réblová (1999a, b) excluded them based on different morphology of the peridium, setae, asci and conidiogenesis. Chaetosphaerella is closely related to Crassochaeta.
Species illustrated in this entry
Chaetosphaerella phaeostroma (Durieu & Mont.) E. Müll. & C. Booth
Maharachchikumbura SSN, Hyde KD, Jones EBG, McKenzie EHC et al. 2016 – Families of Sordariomycetes. Fungal Diversity 79, 1–317
Müller E, Booth C. 1972 – Generic position of Sphaeria phaeostroma. Trans Br mycol Soc 58, 73– 77
Réblová M. 1999a – Studies in Chaetosphaeria sensu lato I. The genera Chaetosphaerella and
Tengiomyces gen. nov. of the Helminthosphaeriaceae. Mycotaxon 70, 387–420
Réblová M. 1999b – Studies in Chaetosphaeria sensu lato II. Coniobrevicolla gen. & sp. nov.
Mycotaxon 70, 421–429
Sivanesan A. 1976 – New British species of Rhamphoria, Trematosphaeria and Chaetosphaerella.
Transactions of the British Mycological Society 67, 469–475
Varghese KIM, Rao VG. 1979 – Two new additions to the Indian Ascomycetes. Biovigyanam 5,