Choanatiara DiCosmo, in Nag Raj & DiCosmo, Can. J. Bot. 62(4): 709 (1984)
Ascomycota, genera incertae sedis
Saprobic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, pycnidial, solitary to gregarious or confluent, initially immersed, ultimately becoming partly erumpent, globose to subglobose, unilocular, glabrous, ostiolate. Ostiole single, papillate, circular or oval, excentric. Conidiomatal wall composed of thick-walled, dark brown to hyaline cells of textura angularis to textura globulos or textura prismatica. Conidiophores arising all around the cavity of the conidiomata, reduced to conidiogenous cells or present, when present, hyaline, cylindrical, unbranched or branched, invested in mucus. Conidiogenous cells hyaline, enteroblastic, phialidic, ampulliform to lageniform, discrete or integrated, smooth-walled, with or without percurrent proliferation. Conidia hyaline, fusiform to naviculate, with an acute apex, and a narrow and truncate base, unicellular, smooth-walled, bearing a funnel-shaped, apical or subapical, mucoid appendage.
Notes: Choanatiara was collected from fallen leaves of Pinus resinosa (Pinaceae) in Canada. Choanatiara is characterized by unilocular conidiomata with sinuate, lateral neck, more than one distinct tissue type, and fusiform to occasionally navicular, unicellular conidia bearing a funnel-shaped, apical or subapical, mucoid appendage. Two species are accepted in the genus, C. gracilis Nag Raj and C. lunata. No sequence data is available for these two species. We re-examined the type specimens of the two Choanatiara species and provide detailed descriptions and photo plates.
Distribution: Canada, India.
Key to the species of Choanatiara
1. Conidiomta with lateral ostiole, average size of conidia 15 × 1.8 µm.................. C. gracilis
1. Conidiomta with central ostiole, average size of conidia 25 × 3 µm...................... C. lunata
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.