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.
References
Barr ME. 1990 – Prodromus to nonlichenized, pyrenomycetous members of class Hymenoascomycetes. Mycotaxon 39, 43–184.
Lumbsch HT, Huhndorf SM. 2010 – Outline of Ascomycota 2009. Myconet 14, 1–64.
Petrak F. 1965 – Über die Gattung Cryptospora Tul. Sydowia 19, 268–278.
Wijayawardene NN, Crous PW, Kirk PM, Hawksworth DL et al. 2014 – Naming and outline of Dothideomycetes–2014 including proposals for the protection or suppression of generic names. Fungal Diversity 69, 1–5.
Wijayawardene NN, Hyde KD, Lumbsch HT, Liu JK et al. 2018 – Outline of Ascomycota: 2017. Fungal Diversity 88, 167–263.
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