Mycosphaerellales » Mycosphaerellaceae


Xenopassalora Crous, in Crous et al., Persoonia 39: 367 (2017).

         Index Fungorum number: IF 823376; Facesoffungi number: FoF 08571, 1 morphological species (Species Fungorum 2021), 1 species with molecular data.

Pathogenic, associated with small red-brown leaf spots. Sexual morph: Unknown. Asexual morph: Mycelium consisting of brown, verruculose to warty, septate, branched, thick-walled hyphae, at time encased in mucoid layer and forming a brown stroma of pseudoparenchymatal cells; hyphae becoming prominently constricted at septa, cells swelling, becoming muriformly septate. Conidiophores solitary, erect on hyphae, geniculous-flexuous, septate, dark brown, thick-walled, roughened. Conidiogenous cells terminal, integrated, medium brown, smooth, consisting of a rachis of sympodial loci; scars round, thickened, darkened. Conidia solitary, aseptate, medium brown, guttulate, verruculose, ellipsoid, apex obtuse, tapering in lower third to truncate hilum, thickened, darkened (adapted from Crous et al. 2017).


Type species: Xenopassalora petrophiles Crous


Notes: Xenopassalora resembles Ramichloridium complex because of its pigmented aseptate conidia but differ in that it does not produce a rachis, and lacks denticles. Xenopassalora also resembles Passalora complex in having conidial hila and thickened and darkened scars but differs in having aseptate conidia, and solitary conidiophores. Xenopassalora is phylogenetically a distinct genus in Mycosphaerellaceae. Molecular markers available for Xenopassalora are ITS, LSU and RPB2.


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