Columnosphaeria Munk, Dansk bot. Ark. 15(no. 2): 103 (1953).

For other synonyms see Index Fungorum

 Saprobic or parasitic on dead wood or leaves in terestial habitats Sexual state: Ascostromata black to dark brown, immersed under the host tissue or erumpent, solitary or gregarious or scattered, globose to subglobose, unilocular, ostiolate at maturity usually by dehiscence of the thin wall apex. Peridium of several layers, dark brown wall cells of textura angularis. Hamathecium lacking pseudoparaphyses. Asci 8-spored, bitunicate, clavate to cylindro-clavate, short pedicellate, apically rounded. Ascospores uni-seriate or irregularly bi-seriate, partially overlapping, hyaline to brown, aseptate, ellipsoidal-fusiform, or fusiform, smooth-walled, sometimes with a thin mucilaginous sheath. Asexual state: See under C. fagi.

Notes: Columnosphaeria was introduced by Munk (1953) as a monotypic genus and typified by Columnosphaeria sarothamni. Von Arx and Müller (1954; 1975) and Munk (1957) considered Columnosphaeria as a synonym of Guignardia (Luttrell 1973) while Sivanesan (1984) synonymized the genus under Discosphaerina and C. sarothamni under D. cytisi. Luttrell (1973) accommodated this genus in Dothideaceae. Barr (2001) included new five species which have been referred to Guignardia and Physalospora and placed Columnosphaeria in Dothioraceae. However, in our phylogenetic tree Columnosphaeria (Discosphaerina) fagi nests in the family Dothideaceae. Barr (2001) transfered Discosphaerina fagi (H.J. Huds.) M.E. Barr, to Columnosphaeria fagi based on its morphology. Phyllosticta Pers., is considered as the current name of Columnosphaeria (Index Fungorum 2014). However, Columnosphaeria sarothamni, the type of Columnosphaeria does not share morphological features with Phyllosticta (Wikee et al. 2013). Hormonema, Sarcophoma and Aureobasidium are reported as the asexual morphs in culture (Barr 2001) and these asexual morphs are usually reported in Dothideales. We examined the type material of Columnosphaeria (C. sarothamni) and C. fagi, which grouped in Aureobasidiaceae. Based on the dothidealen asexual morphs of Columnosphaeria species and the similarity between C. sarothamni and C. fagi tentatively we accept Columnosphaeria in Aureobasidiaceae, Dothideales although the type has morphological characters like Botryosphaeriaceae.

Type species: Columnosphaeria sarothamni Munk, Dansk bot. Ark. 15(no. 2): 103 (1953).