Jattaea Berl., Icon. fung. (Abellini) 3(1-2): 6 (1900)
Diaporthomycetidae, Calosphaeriales, Calosphaeriaceae, Jattaea
Saprobic on wood or decorticated wood in terrestrial habitats. Sexual morph: Ascomata perithecial, solitary to gregarious or form small, loose valsoid groups underneath the host periderm or immersed, dark brown to black, globose to subglobose, coriaceous or membranous, tuberculate or smooth or with brown, septate, hyphal coating, papillate or with a cylindrical neck. Ostioles periphysate. Peridium two-layered, outer layer coriaceous or membranous, composed of dark brown, reddish-brown to brown cells of textura angularis or prismatica or porrecta; inner layer membranous, composed of hyaline cells of textura prismatica. Paraphyses numerous, broad, septate, unbranched, tapering. Ascogenous hyphae discrete, hyaline, smooth, branched, producing a sympodial sequence of hyaline, ovoid to ellipsoidal cells, often with mucronate apex, in dense clusters, each giving rise to an ascus. Asci 8-spored, unitunicate, clavate, pedicellate, mostly in fascicles, with a conspicuously thickened apex lacking a visible discharge mechanism. Ascospores 2-seriate or in a fascicle, hyaline to light brown, allantoid, suballantoid, oblong to subcylindrical, aseptate or transversely septate, smooth-walled. Asexual morph: Hyphomycetous, Acremonium-and phialophora-like. Conidiophores micronematous or semi-macronematous, brown or hyaline, straight or flexuous, septate, branched or unbranched. Conidiogenous cells phialides or adelophialides, terminal, intercalary or lateral, hyaline to subhyaline, ampulliform to subcylindrical. Conidia septate, allantoid, oblong or subcylindrical, hyaline, smooth (adapted from Réblová et al. 2015).
Type species: Jattaea algeriensis Berl., Icon. fung. (Abellini) 3(1-2): 6(1900)
Notes: The asexual morph for Jattaea has always been referred to as phialophora-like (Damm et al. 2008). The monophyletic Jattaea is related to Calosphaeria and Togniniella within Calosphaeriaceae based on multi-gene analysis (Réblová et al. 2015). Although the majority of species belonging to this genus are saprobic, J. algeriensis and J. prunicola have been reported as plant pathogens associated with disease of woody plants (Damm et al. 2008).
Species illustrated in this entry
Jattaea discreta (Berl.) Réblová
Damm U, Crous PW, Fourie PH. 2008 – A fissitunicate ascusmechanism in the Calosphaeriaceae, and novel species of Jattaea and Calosphaeria on Prunus wood. Persoonia 20, 39–52.
Réblová M, Jaklitsch WM, Réblová K, Štěpánek V. 2015 – Phylogenetic reconstruction of the Calosphaeriales and Togniniales using five genes and predicted RNA secondary structures of ITS, and Flabellascus tenuirostris gen. et sp. nov. PloS one 10, e0144616.