Mycosphaerellales » Mycosphaerellaceae

Plurivorosphaerella

Plurivorosphaerella O. Hassan & T.H. Chang, Pl. Dis. 103(2): 210 (2018).

 Index Fungorum number: IF 825548; Facesoffungi number: FoF 08548, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Pathogenic on host forming leaf spot. Sexual morph: Mycosphaerella-like. Pseudothecia black, oval, flask and pear shaped with around 35 asci per pseudothecia. Asci bitunicate, banana-shaped, 8-spored. Ascospores spindle-shaped, uniseptate, unequal, hyaline. Asexual morph: Dematiaceous. Conidiophores reduced to conidiogenous cells, light brown, aseptate. Conidiogenous cells integrated, terminal and lateral, light to dark brown, forming a subcylindrical chain, straight to variously curved, septate, producing chains of spores and catenate (true chain) dimorphic conidia, either 0–1-septate (amero- to didymosphorous) or 3–6-celled (phrago- to scolecosporous), constricted at the septa, and with swollen cells at the base. Conidiogenesis holoblastic (monoblastic or polyblastic), conidiogenous loci neither thickened nor darkened-refractive, rather inconspicuous. Conidia of type I, solitary or in chain, light brown, variable shaped, cylindrical, obovoid, guttulate. Conidia of type II, 3–6 celled, brown in color, constricted at the septa, with swollen cells at the base (adapted from Hassan and Chang 2019).

Type species: Plurivorosphaerella nawae (Hiura & Ikata) O. Hassan & T.H. Chang

Notes: The asexual morph of Plurivorosphaerella is characterised by monoblastic or polyblastic conidiogenesis, and amero- to didymosphorous or phrago- to scolecosporous conidia. The sexual morph is characterised by black, oval, pear-shaped pseudothecia, bitunicate, banana-shaped asci, and spindle-shaped, uniseptate ascospores. Kwon et al. (1998, 2004) identified the asexual morph of Mycosphaerella nawae as Ramularia sp. based on morphology but this classification was not supported by phylogeny. Plurivorosphaerella is morphologically and phylogenetically a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Plurivorosphaerella are ITS, LSU, Actin, BTUB, RPB2 and TEF-1.

 

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