Ramulariopsis Speg., Anal. Mus. nac. B. Aires, Ser. 3 13: 421 (1910).
Index Fungorum number: IF 9692; Facesoffungi number: FoF 08557, 5 morphological species (Species Fungorum 2021), 2 species with molecular data.
Parasitic on vascular plants, foliicolous, usually forming leaf spots. Mycelium internal, septate, branched, hyaline or almost so, smooth; stromata absent to well developed, immersed, hyaline to faintly pigmented. Caespituli amphigenous, whitish. Conidiophores macronematous, mononematous, fasciculate, arising from internal hyphae or stromata, through stomata or erumpent, hyaline, septate, smooth, simple or branched. Conidiogenous cells integrated, terminal, intercalary as well as pleurogenous (as short nodulose protuberances or sub cylindrical branchlets), polyblastic, sympodial, with cicatrized, thickened and darkened loci. Conidia catenate, in simple as well as branched chains, ellipsoid-ovoid, subcylindrical-fusiform, 0–1- to multi-euseptate, hyaline, with thickened and darkened hila. Conidial secession schizolytic (Adapted from Videira et al. 2017).
Type species: Ramulariopsis cnidoscoli Speg.
Notes: Ramulariopsis was introduced by Spegazzini (1910) with R. cnidoscoli as type species and emended by Deighton (1972). Ramulariopsis differs from Ramularia in having conidiophores that are frequently branched and conidiogenous cells that are frequently intercalary or pleurogenous. Ramulariopsis comprises five species but only two are reported from culture, viz. Ramulariopsis gossypii and Ramulariopsis pseudoglycines (Videira et al. 2016). Videira et al. (2016) mentioned that it is still uncertain whether R. gossypii is congeneric with R. cnidoscoli due to slight morphological differences. R. gossypii has thickened and darkened loci while those of R. cnidoscoli are less conspicuous. Ramulariopsis is phylogenetically a well-supported genus closely related to Cercosporella in Mycosphaerellaceae.