Mycosphaerellales » Mycosphaerellaceae


Cytostagonospora Bubák, Annls mycol. 14(3/4): 150 (1916).

Index Fungorum number: IF 7910; Facesoffungi number: FoF 07226, 3 morphological species (Species Fungorum 2022), 1 species with molecular data.

Associated with leaf spot. Sexual morph: Unknown. Asexual morph: Mycelium immersed, dark brown, branched, septate. Conidiomata pycnidial, amphigenous, separate, globose, dark brown to black, immersed, unilocular, thick-walled, clypeate; walls of dark brown, thick-walled textura angularis to textura globulosa, becoming hyaline towards the conidiogenous region, extending in the upper part to become a circular clypeus of similar thickness to the wall. Ostiole central, circular, papillate to short rostrate, depressed, situated immersed within the clypeus. Conidiophores reduced to conidiogenous cells. Conidiogenous cells holoblastic, determinate, discrete, lageniform, hyaline, smooth, formed from the inner cells of the pycnidial wall. Conidia hyaline, 0–2-euseptate, not constricted at septa, base truncate, apex obtuse, thin-walled, eguttulate, smooth, filiform, often curved (adapted from Sutton 1980; Videira et al. 2017).


Type species: Cytostagonospora photiniicola Bubák


Notes: Cytostagonospora is characterised by amphigenous, separate, globose, dark brown to black conidiomata, central, circular, papillate ostiole, holoblastic, determinate, discrete conidiogenous cells, and hyaline, 0–2-euseptate conidia. Cytostagonospora is closely related to Phaeopleospora but differs in that the latter has pycnidial, subglobose, unilocular conidomata, terminal, discrete, brown, verruculose conidiogenous cells, solitary, and hyaline to medium brown conidia with spermatogenous cells developing in conidiomata before the production of conidia. Cytostagonospora is a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Cytostagonospora are ITS, LSU, Btub, RPB2 and TEF-1.


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