Dearnessia Bubák, Hedwigia 58: 25 (1916)
Facesoffungi number: FoF 07271
Ascomycota, genera incertae sedis
Parasitic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown, pycnidial, amphigenous, solitary, immersed to erumpent, globose, unilocular, glabrous. Ostiole single, circular, centrally located. Conidiomatal wall composed of thin-walled cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells formed from the inner cells of the pycnidial wall, hyaline, holoblastic, doliiform to ampulliform or subcylindrical, determinate, smooth-walled. Conidia hyaline, cylindrical or irregular, with rounded apex and truncate base, straight or irregular, 1–4-septate, smooth-walled, guttulate (Sutton 1980, Quaedvlieg 2013).
Type species: Dearnessia apocyni Bubák, Hedwigia 58: 25 (1916)
Notes: Dearnessia remains monotypic and is associated with lesions on Apocynum androsaemifolium (Apocynaceae) in Canada. Quaedvlieg (2013) re-examined the holotype and re-described the genus. No molecular data is available.
Distribution: Canada (Sutton 1980).
Dearnessia apocyni (redrawn from Sutton 1980) a Vertical section of conidioma. b Conidiogenous cells and developing conidia. c Condia.
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.