Mycosphaerellales » Mycosphaerellaceae


Verrucisporota D.E. Shaw & Alcorn, Aust. Syst. Bot. 6(3): 273 (1993).

Index Fungorum number: IF 26057; Facesoffungi number: FoF 08670, 5 morphological species (Species Fungorum 2022), 2 species (as Zasmidium) with sequence data.

Associated with leaf spot. Sexual morph: Unknown. Asexual morph: Colonies round or irregular, hairy, dry, dark brown to black, discrete. Mycelium immersed, pale brown, septate, verrucose. Stroma forming in substomatal cavity, cells brown-walled, pseudoparenchymatous. Conidiophores macronematous, mononematous, caespitose, emerging through the stomata, simple, flexuous, often geniculate, approximately 4-septate, mainly smooth, dark reddish brown or slightly olivaceous, from a bulbous base tapering towards the apex, but often becoming more swollen, and also verrucose at the apex. Conidiogenous cells cylindrical, becoming geniculate, integrated, terminal, becoming intercalary, polyblastic, proliferating sympodially, with conspicuous, cicatrized, protuberant, conidiogenous loci. Conidia cylindrical, narrowing slightly to an obtuse apex and a truncate base with a distinct thickened hilum, medium reddish brown, straight or curved, with 1–6(–7) mainly unconstricted eusepta, thick-walled, verrucose (adapted from description of Verrucisporota proteacearum in Taylor and Crous 1999).

 Type species: Verrucispora proteacearum D.E. Shaw & Alcorn.

Notes: Verrucisporota is characterised by hairy, dry, dark brown colonies, macronematous, mononematous, caespitose conidiophores, cylindrical, becoming geniculate, integrated, terminal conidiogenous cells and cylindrical conidia narrowing slightly to an obtuse apex. The holotype V. proteacearum was found on Finschia chloroxantha from Papua New Guinea (Shaw and Alcorn 1967). Videira et al. (2017) isolated V. proteacearum from a different host and a different country and their strain had broader conidia compared to the original description. Videira et al. (2017) could not resolve the phylogenetic placement of Verrucisporota due to doubtful morphology. Braun et al. (2013) considered Verrucisporota as a synonym of Zasmidium but this was not confirmed with molecular data. The placement of Verrucisporota in Mycosphaerellaceae is doubtful. More collections with DNA sequence data are needed to confirm the generic placement of Verrucisporota. Molecular markers available for Verrucisporota are ITS, LSU, Actin, BTUB, RPB2 and TEF-1.


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