Keissleriella
Keissleriella Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 128(7-8): 582 (1919)
= Chaetopyrena Sacc., Syll. fung. (Abellini) 2: 184 (1883)
= Chaetopyrenis Clem. & Shear, Gen. fung., Edn 2 (Minneapolis): 70 (1931)
= Coenosphaeria Munk, Dansk bot. Ark. 15(no. 2): 133 (1953)
= Zopfinula Kirschst., Annls mycol. 37(1/2): 98 (1939)
Citation when using this entry, Chen C. et al. in prep. – An updated monograph of Coelomycetes, Mycosphere
Index Fungorum, Facesoffungi number, MycoBank, GenBank
Classification: Lentitheciaceae, Pleosporales, Dothideomycetes, Ascomycota, Fungi
Saprobic on the host plants. The sexual morph is characterised by pseudothecial ascomata, which are immersed or erumpent, separate, black, globose to subglobose and ostiolate. The ostiole is papillate and located in the center, with dark brown to black setae. The peridium is comprised of textura angularis, thick-walled and pale brown to brown cells. The pseudoparaphyses is septate, branched, filamentous. Asci are 8-spored, bitunicate, fissitunicate, clavate to cylindrical, short-stalked, apex rounded and with a shallow ocular chamber. Ascospores are hyaline, biseriate, fusiform or clavate, smooth-walled, septate, constricted at the septum, surrounded by mucilaginous sheath (Barr 1990, Tanaka et al. 2015, Wanasinghe et al. 2018). The asexual morph is characterised by the immersed to semi-immersed pycnidial conidiomata, which are dark brown to black, scattered to gregarious or confluent, globose to subglobose, glabrous and unilocular. The ostiole is papillate, single, circular and located in the center. The pycnidial wall is comprised of textura angularis, thick-walled, brown to hyaline cells. Conidiophores are formed from the inner cells of the conidiomata wall, which are septate, branched, cylindrical and hyaline. Conidiogenous cells are enteroblastic and phialidic, determinate, scattered or gregarious, cylindrical to lageniform, or ampuliform, smooth-walled and hyaline. Conidia are hyaline or brown, 0–1-septate, guttulate, cylindrical or oblong, and smooth-walled. Spermatia are present or absent, hyaline, cylindrical or bone-shaped, and smooth-walled (Höhnel 1919, Li et al. 2020).
Type species: Keissleriella aesculi (Höhn.) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 128(7-8): 582 (1919)
= Pyrenochaeta aesculi Höhn., Ber. dt. bot. Ges. 35(3): 249 (1917)
Notes: Keissleriella was introduced by Höhnel (1919) based on K. aesculi as the type species. Munk (1957) placed this genus in Lophiostomataceae, then von Arx & Muller (1975) transferred it to Pleosporaceae. Later Barr (1990) placed it in Melanommataceae. Subsequently, Lumbsch & Huhndorf (2007) considered Keissleriella as a generic taxon in Massarinaceae. However, Zhang et al. (2009) introduced it to Lentitheciaceae which was subsequently accepted by subsequent authors (Hyde et al. 2013, Tanaka et al. 2015). Tanaka et al. (2015) described the asexual morph of K. quadriseptata and introduced three new species in Keissleriella. Currently, there are 42 species listed in Keissleriella in Species Fungorum (July 2024). There are more than 250 sequence data available for Keissleriella in GenBank (July 2024). The updated taxonomic treatment of this genus is Lentitheciaceae, in Pleosporales (Dothideomycetes) (Wijayawardene et al. 2022).
For all accepted species: see Species Fungorum, and search Keissleriella.