Myxothyrium Bubák & Kabát, Svensk bot. Tidskr. 9: 379 (1915)
Facesoffungi number: FoF 07457
Ascomycota, genera incertae sedis
Saprobic on dead leaves of Vaccinium vitis-idaea (Ericaceae). Sexual morph: undetermined. Asexual morph: Conidiomata dark brown, stromatic, pycnidial, hypophyllous, solitary to gregarious or confluent, epidermal to subepidermal, immersed, subglobose, unilocular or multi-locular, glabrous. Ostiole absent, dehiscence by irregular split of apical wall. Conidiomatal wall composed of thick-walled, dark brown cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells arising from the inner wall layer of conidiomata, hyaline, enteroblastic, phialidic, doliiform to ampulliform, determinate, smooth-walled. Conidia hyaline, cylindrical to fusiform, with obtuse ends, straight, unicellular, smooth-walled, with several large guttules (adapted from Sutton 1980).
Type species: Myxothyrium leptideum (Fr.) Bubák & Kabát, Svensk bot. Tidskr. 9: 379 (1915)
Notes: Sutton (1980) re-described Myxothyrium and accepted a single species. The second species M. camelliarum was added by Zhao and Zhao (2012), but this has not been re-examined. Wijayawardene et al. (2017b) accepted only the type species in the genus. Myxothyrium can be confused with Phoma in form of conidiomata, conidiogenous cells and conidia, and it may be taxonomically congeneric with Phoma. Sequence data is not available for Myxothyrium and fresh collections are needed to verify the relationship between Myxothyrium and Phoma.
Distribution: Sweden (Sutton 1980).
Mxothyrium leptideum (redrawn from Sutton 1980) a Vertical section of conidioma. b Conidiogenous cells and developing conidia. c Conidia.
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.