Jahniella Petr., Annls mycol. 18(4/6): 123 (1921) 
Facesoffungi number: FoF 07395
Ascomycota, genera incertae sedis
Saprobic on the host plant. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown, pycnidial, solitary, subepidermal to epidermal, immersed, globose in sectional view, unilocular, glabrous, ostiolate. Ostioles single, circular, papillate, centrally located, with a distinct channel. Conidiomatal wall composed of thick-walled, dark brown cells of textura angularis in the exterior, becoming thicker, pale brown to hyaline cells towards conidial hymenium. Conidiophores reduced to conidiogenous cells. Conidiogenous cells arising from the inner wall layer of conidiomata, hyaline, holoblastic, ampulliform, discrete, indeterminate, smooth-walled. Conidia hyaline, cylindrical to fusiform, tapered towards apex, truncate at the base, straight or slightly curved, 3–4-septate, smooth-walled, eguttulate.
Type species: Jahniella bohemica Petr., Annls mycol. 18(4/6): 123 (1921) 
Notes: Jahniella was re-described by Sutton (1980) and Quaedvlieg et al. (2013). Three taxa (e.g., J. bohemica Petr., J. campanulae-cervicariae (Vestergr.) Petr., J. hordei Petr.) are accepted in the genus, but none of them have been studied with molecular data. Jahniella is similar to Septoria in having hyaline, multi-septate conidia, but it can be separated from the latter by conidiogenous cells. Septoria has proliferate sympodially and percurrently conidiogenous cells, a feature absent in Jahniella (Sutton 1980, Quaedvlieg et al. 2013). This taxon needs recollection and study. This taxon needs recollection and study.
Distribution: Czech Republic, France, Germany, Russia, Ukraine (Quaedvlieg et al. 2013, 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.