Pleosporales » Didymosphaeriaceae

Chromolaenicola

Chromolaenicola Mapook & K.D. Hyde, in Mapook et al., Fungal Diversity 101: 20 (2020).

Index Fungorum number: IF 557279; Facesoffungi number: FoF 07783, 5 morphological species (Species Fungorum 2022), 5 species with molecular data.

Saprobic on dead stems. Sexual morph: Ascomata immersed to semi-immersed, solitary or scattered, appearing as small dark spots, coriaceous, globose to subglobose, brown to dark brown. Ostiolar neck protruding. Peridium 3–4 layers, comprising dark brown cells of textura angularis. Hamathecium composed of cylindrical to fliform, septate, branching pseudoparaphyses. Asci 6–8-spored, bitunicate, cylindrical, straight or slightly curved, apically rounded, pedicellate with an ocular chamber. Ascospores slightly overlapping, uni-seriate, initially hyaline, uniseptate when immature, becoming reddish brown to brown at maturity, ellipsoid to broadly fusiform, muriform, 3 transverse septate, and 1 vertical septum, constricted at the central septum, straight or slightly curved, without gelatinous sheath. Asexual morph: Conidiomata pycnidial, solitary, immersed to semi-immersed, uniloculate, globose to obpyriform, yellowish brown to brown, sometimes appearing as colonies on the host surface, superficial, scattered, gregarious, dark brown to black, not easy to remove from the host surface. Ostiole central, papillate. Pycnidial wall comprising 2–4 layers, pale brown to light brown cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline and unbranched, smooth, elongated, broadly fliform to ampulliform. Conidia oblong or oval to ellipsoid, globose to subglobose, hyaline to pale brown, aseptate when immature, becoming reddish brown to brown, uniseptate when mature, not constricted at the septum, thick-walled finely verruculose (adapted from Mapook et al. 2020).

Type species: Chromolaenicola nanensis Mapook & K.D. Hyde

Notes: Chromolaenicola is characterised by immersed to semi-immersed ascomata, cylindrical, straight or slightly curved, apically rounded, 6–8-spored asci, and hyaline, uniseptate ascospores. The asexual morph is characterised by pycnidial, solitary, immersed to semi-immersed, uniloculate conidiomata, central, papillate ostiole, elongated, broadly filiform to ampulliform conidiogenous cells, and oblong or oval to ellipsoid, globose to subglobose hyaline to pale brown, aseptate conidia. Chromolaenicola differs from the closely related genus Cylindroaseptospora in having oblong or oval to ellipsoid, globose to subglobose conidia, hyaline to pale brown and aseptate conidia while the latter has cylindrical, hyaline, aseptate conidia (Jayasiri et al. 2019, Mapook et al. 2020). The ideal molecular markers to differentiate species of Chromolaenicola are ITS and TEF gene region. Chromolaenicola is morphologically and phylogenetically a well-supported and monophyletic genus in Didymospheriaceae but with low statistical support. Molecular markers available for Chromolaenicola are ITS, LSU, SSU, RPB2 and TEF-1.

 

 

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