Mycosphaerellales » Mycosphaerellaceae


Juncomyces Crous, in Crous et al., Persoonia 44: 333 (2020).

Index Fungorum number: IF 835403; Facesoffungi number: FoF 11159, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Mycelium consisting of brown, smooth to warty, septate, branched. Sexual morph: Unknown. Asexual morph: Conidiophores solitary, subcylindrical, mostly unbranched, erect, thick-walled, brown, verruculose, warty, multiseptate, rarely forming from a brown stroma, with a few fasciculate conidiophores. Conidiogenous cells integrated, terminal, straight to geniculate-sinuous, proliferating sympodially with several apical loci, flattened, thickened, darkened, and refractive. Conidia solitary, acicular to slightly obclavate, mostly thick-walled, verruculose, guttulate, apex subobtuse, base truncate, thickened, darkened and refractive, septate (adapted from Crous et al. 2020).


Type species: Juncomyces californiensis Crous


Notes: Juncomyces was introduced by Crous et al. (2020) with J. californiensis as type species. Juncomyces is characterised by solitary, subcylindrical, mostly unbranched conidiophores, straight to geniculate-sinuous conidiogenous cells and acicular to slightly obclavate, mostly thick-walled, verruculose, guttulate conidia. Juncomyces resembles Graminopassalora but differs in having solitary conidiophores (sometimes fascicles of 2–3), and multiseptate, obclavate conidia. Juncomyces is morphologically and phylogenetically a distinct genus in Mycosphaerellaceae. Molecular markers available for Juncomyces include J. patwiniorum (LSU, ITS, RPB2) and J. californiensis (LSU, ITS, RPB2).


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