Ascomycota, genera incertae sedis
Saprobic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, stromatic, pycnidial, solitary or aggregated into linear stromata, immersed to semi-immersed, globose, unilocular or multilocular, glabrous, ostiolate. Ostiole one per locule, circular, papillate. Conidiomatal wall composed of thick-walled, dark brown to black cells of textura angularis in the exterior, becoming thin-walled and paler toward the hymenium. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline, enteroblastic, phialidic, ampulliform to doliiform, determinate, smooth-walled, with a minute apical channel, periclinal thickenings at the collarette zone. Conidia hyaline, fusiform, apex pointed or rounded, base truncate or rounded, straight or slightly curved, 1–3-septate, smooth-walled, eguttulate (Sutton 1980).
Type species: Cytoplacosphaeria rimosa Petr., Annls mycol. 17(2/6): 79 (1920) 
Notes: Two taxa are accepted in Cytoplacosphaeria, C. phragmiticola Poon & K.D. Hyde on decaying stems and leaf sheaths of Phragmites australis and C. rimosa on culms of Phragmites communis, P. vulgaris (Poaceae) or salt marsh plant host (Sutton 1980, da Luz Calado and Barata 2012, Wijayawardene et al. 2017a). The sexual morph was tentatively regarded as Scirrhia rimosa (Alb. & Schwein.) Fuckel (Petrak 1924), but there is no further reference to this. No molecular data is available.
Distribution: Belgium, Czechia, Latvia, Sweden, UK (https://www.gbif.org/).
Cytoplacosphaeria rimosa (redrawn from Sutton 1980) a Conidia. c Conidiogenous cells and developing conidia. b Vertical section of conidioma.
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.