Dothideomycetes » Dothideomycetes, genera incertae sedis

Dothivalsaria

Citation: Pem D et al. (2019) Mycosphere Notes 275-324: A morphotaxonomic revision and typification of obscure Dothideomycetes genera (incertae sedis). Mycosphere 10(1), 1115–1246

 

Dothivalsaria Petr., Sydowia 19(1-6): 283 (1966)

Saprobic on dead branches. Sexual morph: Stromata pseudostromatic, immersed or semi-immersed from bark on wood, scattered or gregarious, appearing on the host surface as dark brown to black, smooth, hollow, circular dots. Ascomata subglobose to globose, carbonaceaous, black, solitary, scattered throughout the host, papillate. Peridium composed of pale brown compressed cells of textura angularis. Ostiole inconspicuous at the surface, fragile, shiny. Paraphyses numerous, sparsely branched, hyaline, septate, filamentous, cylindrical, at times irregular, apically free. Asci cylindrical, bitunicate, fissitunicate, 8-spored, apex thin, no ring visible in Congo red. Ascospores uniseriate, ellipsoidal, 1-septate, dark brown, slightly constricted at the septum, surface finely warted or reticulate with the ends broadly rounded. Asexual morph: Undetermined.

 

Type species – Dothivalsaria megalospora (Auersw.) Petr.

 

Notes – The monotypic genus Dothivalsaria was introduced by Petrak (1965) based on D. megalospora. The genus is characterized by immersed, average to large sized ascomata which usually aggregate under blackened stromatic tissues and have trabeculate pseudoparaphyses. Asci are cylindrical. Ascospores are brown, ellipsoid, 1-septate and uniseriate in the asci (Barr 1990). The ascostroma of D. megalospora is similar to those of Aglaospora profusa (Barr 1990), but their relationships are unclear. The genus was previously placed in Massariaceae by Lumbsch & Huhndorf (2010). However, later it was accepted as a genus in Dothideomycetes, genera incertae sedis (Wijayawardene et al. 2014, 2018). The asexual morph of this genus is unknown. We examined a specimen of Dothivalsaria under the code NY 02977713 but could not find an appropriate placement. The genus Dothivalsaria is therefore retained in Dothideomycetes, genera incertae sedis.

 

 

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