Mycosphaerellales » Mycosphaerellaceae


Sultanimyces Videira & Crous, in Videira et al., Stud. Mycol. 87: 326 (2017).

Index Fungorum number: IF 822704; Facesoffungi number: FoF 08565, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Pathogenic. Caespituli hypophyllous, punctiform, dark brown. Sexual morph: Unknown. Asexual morph: Mycelium internal, hyphae almost hyaline. Stroma substomatal, composed of densely packed pale olivaceous hyphae. Conidiophores in fascicles, emerging from stromata, pale to deep olivaceous, straight, smooth. Conidiogenous cells polyblastic, integrated, terminal, more or less clavate, usually continuous above basal septum but sometimes septate and swollen at the base, conidiogenous loci conspicuous and slightly protruding. Conidia solitary, pale to moderate olivaceous, ellipsoid, fusiform, subcylindrical or obclavate, straight, smooth to verruculose, aseptate but usually septate, median septum usually thicker, sometimes slightly constricted at median septum, with conspicuous and slightly protruding hila (adapted from Videira et al. 2017).

 Type species: Sultanimyces vitiphyllus (Speschnew) Videira & Crous

Notes: Sultanimyces is characterised by substomatal stromata, composed of densely packed pale olivaceous hyphae, polyblastic, integrated conidiogenous cells, and solitary, pale to moderate olivaceous, ellipsoid conidia. Sultanimyces vitiphyllus previously known as Coryneum vitiphyllum was transferred to Asperisporium based on the polyblastic conidiogenous cells with conspicuous scars and euseptate, verrucose conidia with conspicuous hila (Videira et al. 2017). Minnis et al. (2011) reported that A. vitiphyllum is not congeneric with A. caricae, the type species of Asperisporium. Asperisporium vitiphyllum resembles A. caricae in having conidiophores that emerge from dark stromata, densely arranged polyblastic conidiogenous cells but conidia of the latter are shorter and wider, mostly ellipsoid and typically uniseptate. Sultanimyces also resembles cercosporidium-like species in having multiseptate conidia but can be differentiated based on DNA sequence data. Sultanimyces is a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Sultanimyces are ITS, LSU and RPB2.


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