Mycosphaerellales » Mycosphaerellaceae


Ragnhildiana Solheim, Mycologia 23(5): 402 (1931).

Index Fungorum number: IF 9686; Facesoffungi number: FoF 08556, 8 morphological species (Species Fungorum 2022), 6 species with molecular data.

Associated with leaf spot. Sexual morph: Unknown. Asexual morph: Conidiophores tufted, emerging through the stomata or rupturing the epidermis or effused on an external mycelium, simple or monopodially branched, more or less geniculate, straight or flexuous, continuous or septate, arising from a loose to compact or tuberculate stroma, hyaline to dark-brown. Conidia catenate, acrogenous at times appearing lateral due to further development of the conidiophores, cylindrical, continuous or multi-septate, hyaline to dark-brown (adapted from Solheim 1931).


Type species: Ragnhildiana agerati (F. Stevens) F. Stevens & Solheim


Notes: Ragnhildiana was synonymized with Mycovellosiella by Muntanola (1960). Crous and Braun (2003) synonymized both Ragnhildiana and Mycovellosiella with Passalora. Later, the type species of Passalora, P. bacilligera was recollected and these three genera were found to be phylogenetically distinct. Hence, the name Ragnhildiana was resurrected. Ragnhildiana is characterised by integrated, terminal, mono- or polyblastic conidiogenous cells with solitary or catenate subhyaline to brown conidia. In the phylogenetic analysis of Videira et al. (2017), Ragnhildiana clustered as a distinct lineage in Mycosphaerellaceae. Molecular markers available for Ragnhildiana include ITS, LSU, SSU and RPB2.


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