Rileya A. Funk, Can. J. Bot. 57(1): 7 (1979)
Facesoffungi number: FoF 07580
Ascomycota, genera incertae sedis
Parasitic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata black, pycnidial, scattered to gregarious, semi-immersed, innate-erumpent, globose, carbonaceous, unilocular, glabrous, ostiolate. Ostiole single, slightly papillate, centrally located. Conidiomatal wall composed of thick-walled, dark brown to brown cells of textura globulosa to textura angularis in the exterior, gradually merging with relatively thinner, hyaline cells of textura prismatica in the conidial hymenium. Conidiophores arising from inner layer cells of conidiomata, hyaline, cylindrical, branched, septate, smooth-walled, invested in mucus. Conidiogenous cells hyaline, enteroblastic, annellidic, cylindrical, integrated or discrete, indeterminate, smooth-walled. Conidia hyaline, elongate-fusiform, truncate at the base, terminal, scolecosporous, with the distosepta thinner than the periclinal wall, smooth-walled, apical cell attenuated into a long tubular, flexuous appendage (adapted from Nag Raj and DiCosmo 1980, Nag Raj 1993).
Type species: Rileya piceae A. Funk, Can. J. Bot. 57(1): 7 (1979)
Notes: Rileya is monotypic. Rileya piceae was collected from living branches of Picea sitchensis (Pinaceae). The genus is characterized by globose, carbonaceous, pycnidial conidiomata, annellidic, cylindrical conidiogenous cells and scolecosporous, distoseptate conidia with a long tubular, flexuous apical appendage (Funk 1979, Nag Raj 1993). Rileya shares similar distoseptate conidia with Coryneum (e.g. C. megaspermum, C. stromatoideum, C. umbonatum), and Massariothea. However, Massariothea has paraphyses which are absent in Coryneum and Rileya. Coryneum differs from Rileya by its acervular conidiomata and brown, narrowly to broadly fusiform or globose conidia without an appendage (Sutton 1980, Nag Raj 1993). There is no molecular data available for Rileya. Fresh collections are needed to place it in a natural group.
Distribution: Canada (Nag Raj 1993).
Rileya piceae (redrawn from Nag Raj and DiCosmo 1980) a Vertical section of conidioma. b Enlarged view of conidiomatal wall. c Conidia. d Conidiophores, conidiogenous cells and developing conidia.
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