Mycosphaerellales » Mycosphaerellaceae


Acervuloseptoria Crous & Jol. Roux, in Crous et al., Persoonia 32: 275 (2014).

Index Fungorum number: IF 808951; Facesoffungi number: FoF 08471, 3 morphological species (Species Fungorum 2021), 3 species with molecular data.

Plant pathogenic, foliicolous. Sexual morph: Unknown. Asexual morph: Conidiomata black, amphigenous, exuding a creamy-white conidial cirrhus, subepidermal, erumpent, multilocular, with upper layer breaking open irregularly and leaving conidioma to have acervular appearance; wall of 3–6 layers of brown textura angularis to textura intricata, basal layers pale brown, roof of conidioma dark brown; in culture conidiomata acervular with elements of conidiomatal roof remaining like brown strands along the sides of conidioma. Conidiophores subcylindrical, straight to once geniculate, pale brown, verruculose, septate, branched or not. Conidiogenous cells terminal and lateral, subcylindrical, pale brown to subhyaline, verruculose to smooth, proliferating sympodially and percurrently. Conidia narrowly obclavate to sub cylindrical, flexuous, guttulate, smooth, hyaline, apex sub acutely rounded, base obconically truncate, septate (Adapted from Crous et al. 2014).


Type species: Acervuloseptoria ziziphicola Crous & Jol. Roux


Notes: Acervuloseptoria was introduced by in Crous et al. (2014) with A. ziziphicola as type species. Acervuloseptoria is characterized by black, amphigenous conidiomata, subcylindrical conidiophores, terminal and lateral conidiogenous cells and obclavate to sub cylindrical conidia.  Acervuloseptoria resembles septoria but differs in having a peculiar conidiomatal morphology, with black, erumpent conidiomata, from which the top layer degenerates, leaving a conidiomatal body that appears acervular.  Acervuloseptoria is unique in having conidiophores that are slightly pigmented and verruculose in their lower part.  Phylogenetically, Acervuloseptoria is distinct from septoria-like genera and well-supported in Mycosphaerellaceae.


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