Dichotomopilus X.Wei Wang, Samson & Crous, in Wang, Houbraken, Groenewald, Meijer, Andersen, Nielsen, Crous & Samson, Stud. Mycol. 84: 185 (2016)
Sordariomycetidae, Sordariales, Chaetomiaceae, Dichotomopilus
Index Fungorum number: IF 818840; Facesoffungi number: FoF 08466; 12 species with sequence data.
Isolated from air, dust, feather, paper and textile. Sexual morph: Ascomata superficial, spherical, ellipsoid or ovate, ostiolate. Terminal hairs seta-like and the originating, then followed by the majority developing dichotomously or branched irregularly to form a net structure to hold ascospores, occasionally branched and seta-like together, infrequently staying seta-like, generally punctulate or verrucose, rarely smooth. Lateral hairs unbranched, seta-like, tapering towards the apex. Ascomatal wall made up of walls of textura intricata or epidermoidea in surface view, or of textura angularis in few species. Asci 8-spored, fasciculate, clavate, roughly clavate or ovate, pedicellate, evanescent. Ascospores biseriate or irregularly arranged, brown at maturity, narrowly ovate, ovate, broad ovate, rarely cylindrical, bilaterally flattened, attenuated at one or both ends, usually with an apical or slightly sub-apical germ pore at the most attenuated end, the reverse end more or less apiculate if not attenuate, generally less than 7.5 μm long. Asexual morph: unknown (adapted from Wang et al. 2016).
Type species: Dichotomopilus indicus (Corda) X.Wei Wang & Samson, in Wang, Houbraken, Groenewald, Meijer, Andersen, Nielsen, Crous & Samson, Stud. Mycol. 84: 189 (2016)
Notes: The genus Dichotomopilus was established by Wang et al. (2016) to include two new species, D. pseudofunicla and D. pseudoerectus, and another ten species transferred from Chaetomium. A new collection of D. ramosissimum was recorded on Clematis vitalba in the UK by Phukhamsakda et al. (2020). The genus is characterised by superficial, sphaerical, ellipsoid or ovate, ostiolate ascomata, with seta-like, branched, often ornamented terminal hairs, unbranched, seta-like lateral hairs tapering towards the apex, clavate to ovate, pedicellate, evanescent asci and fasciculate brown, ovate, bilaterally flattened ascospores attenuated at one or both ends and with apical or slightly subapical germ pores. Asexual morphs are undetermined. Dichotomopilus ramosissimus is illustrated in this entry (notes from Hyde et al. 2020).
Species illustrated in this entry:
Dichotomopilus ramosissimus (X.Wei Wang & L. Cai) X.Wei Wang & Samson
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