Diaporthales » Stilbosporaceae


Stilbospora Pers., Neues Mag. Bot. 1: 93 (1794)

Diaporthomycetidae, Diaporthales, Stilbosporaceae, Stilbospora

Index Fungorum number: IF10116; Facesoffungi number: FoF 01711; 16 morphological species; 3 species with sequence data.


Saprobic and weakly pathogenic on bark of trees and shrubs. Sexual morph: Pseudostromata immersed in host, causing the latter to crack open by lifting it, inconspicuous. Ectostroma discreet, seldom erumpent, light grey to amber or brown, comprises several tightly packed periphysate ostioles in a gel matrix. Entostroma composed of hyaline to brown hyphae, surrounding numerous firmly packed ascomata in a circular or valsoid arrangement. Ascomata perithecial, immersed, aggregated, depressed globose to lenticular, dark brown to black, in a single layer, ostiolate. Ostioles not obvious, not projecting, cylindrical, periphysate, comprising pale brown walls, convergent in groups, visible as subhyaline to brown circles in the disc. Peridium comprising dark brown cells of textura angularis from surface view. Asci 8-spored, unitunicate, ellipsoid to fusoid, sessile, initially attached to the base, later floating in centrum, with a J-, refractive, apical ring. Ascospores uni- to biseriate, ellipsoid to oblong, brown, 3-euseptate, comprising a gelatinous appendage at both ends. Asexual morph: Ceolomycetous. Conidiomata immersed, acervular, visible as dark brown to black spots on host, paraphysate. Paraphyses septate, unbranched, hyaline. Conidiophores unbranched, cylindrical, hyaline. Conidiogenous cells annellidic. Conidia ellipsoid to oblong, brown, usually slightly curved, 3-euseptate, thick-walled, with truncate base, comprising a narrow hyaline sheath (adapted from Voglmayr & Jaklitsch 2014).


Type species: Stilbospora macrosperma Pers., Syn. meth. fung. (Göttingen) 1: 96 (1801)


Notes: The type species Stilbospora macrosperma was epitypified by Voglmayr & Jaklitsch (2014). Prosthecium (the asexual morph) includes opportunistic and moderately phytopathogenic taxa, which are responsible for the branch dieback or twig blight in several overwintered plants (Voglmayr & Jaklitsch 2008). Some species of Prosthecium were also recorded from corticated and dead branches of the same plants (Voglmayr & Jaklitsch 2014).




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