Hapalosphaeria Syd., in Diedicke & Sydow, Annls mycol. 6(4): 305 (1908)
Ascomycota, genera incertae sedis
Parasitic on anthers of Rubus fruticosus, R. idaeus and Rubus spp. (Rosaceae) (Sutton 1980). Sexual morph: undetermined. Asexual morph: Conidiomata pale brown, pycnidial, scattered or gregarious, immersed to erumpent, globose, unilocular, glabrous. Ostiole absent, dehiscence by a relatively wide apical opening. Conidiomatal wall composed of thin-walled, pale brown cells of textura angularis. Conidiophores formed from the inner wall layer of conidiomata, reduced to conidiogenous cells. Conidiogenous cells hyaline, enteroblastic, phialidic, ampulliform or dolliform, determinate, smooth-walled. Conidia hyaline, globose, unicellular, smooth-walled, eguttulate.
Type species: Hapalosphaeria deformans (Syd. & P. Syd.) Syd., in Diedecke & Sydow, Annls mycol. 6(4): 305 (1908)
Notes: Hapalosphaeria is monotypic and no molecular data is available. This genus shares similar form of conidiomata, conidiogenous cells and conidia with phoma-like fungi. However, phoma-like fungi are polyphyletic. Species within this group have been assigned to various families such as Cucurbitariaceae, Didymellaceae, Pleosporineae, Pseudopyrenochaetaceae and Pyrenochaetopsidaceae (De Gruyter et al. 2010, Chen et al. 2015, 2017, Valenzuela-Lopez et al. 2018). Thus, it is difficult to place Hapalosphaeria in a natural group based on morphological characters. Fresh collections of H. deformans are needed to epitypify the genus.
Distribution: Germany, UK (Sutton 1980, Wijayawardene et al. 2017).
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.