Mycosphaerellales » Mycosphaerellaceae


Pedrocrousiella Rajeshkumar, U. Braun & J.Z. Groenew., in Rajeshkumar et al., Fungal Systematics and Evolution 7: 168 (2021).

 Index Fungorum number: IF 838146; Facesoffungi number: FoF 11192, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Pathogenic on host. Sexual morph: Unknown. Asexual morph: Conidiomata foliicolous, sporodochial, scattered, olive brown to dark brown, erumpent. Conidiophores arising from stromata, densely fasciculate, aseptate or septate, macronematous, mononematous, simple, straight to slightly sinuous, almost smooth to verruculose-rugose, pale brown, wall thin to somewhat thickened. Conidiogenous cells integrated, terminal, or conidiophores reduced to conidiogenous cells, cylindrical (geniculation caused by sympodial proliferation not evident), polyblastic, often with numerous conidiogenous loci thickened and darkened (cicatrized). Conidia formed singly, broad ellipsoid, ovate or obclavate, 0–2-septate, wall thin, pale olivaceous to olivaceous brown, verruculose, apices obtuse, bases truncated, basal hilum barely to somewhat thickened and darkened, schizolytic (adapted from Rajeshkumar et al. 2021).

 Type species: Pedrocrousiella pongamiae (Syd. & P. Syd.) Rajeshkumar, U. Braun & J.Z. Groenew.

Notes: Pedrocrousiella is characterised by foliicolous, sporodochial, scattered conidiomata, aseptate or septate, macronematous, mononematous conidiophores, integrated, terminal conidiogenous cells and 0–2-septate, thin-walled, pale olivaceous to olivaceous brown conidia. Rajeshkumar et al. (2021) referred Pedrocrousiella to Mycosphaerellaceae based on phylogenetic analysis of LSU and rpb2 sequence and blast search using ITS sequence data. Rajeshkumar et al. (2021) mentioned that A. pongamiae-pinnatae seems to be a heterotypic synonym of A. pongamiae based on similar morphology and occurrence on same host but this could not be confirmed as the type material of A. pongamiae-pinnatae is lost. Pedrocrousiella is phylogenetically closer to Distocercospora but differs morphologically as the latter has nonsporodochial, loosely fasciculate, often branched, long conidiophores, and distoseptate conidia. Rajeshkumar et al. (2021) were unsuccessful in trying to prove a asexual-sexual morph relationship between Pedrocrousiella pongamiae and Mycosphaerella pongamiae, as hypothesized by Sivanesan (1985), hence they considered these two genera as distinct. Pedrocrousiella is morphologically and phylogenetically a distinct genus in Mycosphaerellaceae. Molecular markers available for Pedrocrousiella include LSU, ITS and RPB2.


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