Keissleriella Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 128(7-8): 582 (1919)
Facesoffungi number: FoF 07424
Dothideomycetes, Pleosporomycetidae, Pleosporales, Lentitheciaceae
Saprobic on the host plant in terrestrial habitat. Sexual morph: see Barr (1990), Tanaka et al. (2015), Wanasinghe et al. (2018). Asexual morph: Conidiomata dark brown to black, pycnidial, solitary to gregarious or confluent, immersed to semi-immersed, globose to subglobose, unilocular, glabrous, ostiolate. Ostiole single, circular, papillate, centrally located. Conidiomatal wall composed of thick-walled, brown to hyaline cells of textura angularis. Conidiophores arising from the inner wall layer of the conidiomata, hyaline, cylindrical, septate, branched and septate. Conidiogenous cells hyaline, enteroblastic, phialidic, cylindrical to lageniform, or ampuliform, integrated or discrete, determinate, smooth-walled. Conidia hyaline or brown, cylindrical or oblong, 0–1-septate, guttulate, smooth-walled. Spermatia absent or present, hyaline, cylindrical or bone-shaped, smooth-walled.
Type species: Keissleriella aesculi (Höhn.) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 128(7-8): 582 (1919)
Notes: Over 40 taxa are accepted in the genus (Tanaka et al. 2015, Tibpromma et al. 2017, Wanasinghe et al. 2018). Zalasky (1974) linked K. emergens to Diplodia tumefaciens (Shear) Zalasky. Sivanesan (1984) connected K. alpina and K. cladophila to Dendrophoma, and K. gallica to Ascochyta. However, Ascochyta, Diplodia and Dendrophoma are confirmed in Didymellaceae (Aveskamp et al. 2010, Chen et al. 2015, 2017, Valenzuela-Lopez et al. 2018), Botryosphaeriaceae (Liu et al. 2012, Phillips et al. 2013, Slippers et al. 2013) and Chaetosphaeriaceae (Crous et al. 2012b), respectively. Tanaka et al. (2015) introduced three new taxa in Keissleriella, and described the asexual morph of K. quadriseptata as having hyaline to brown, aseptate to 1-septate, cylindrical conidia from culture. Crous et al. (2015a) and Tibpromma et al. (2017) noted that Pleurophoma and Keissleriella might be related based on their phylogenies, but that this needed further investigation. We found that a fresh collection on Ammophila arenaria shares similar morphology with the generic type of Pleurophoma (P. pleurospora), but can be distinguished by phylogeny. Based on phylogeny, this strain is regarded as the microconidial or spermogonial state of K. quadriseptata. Sufficient samples of pleurophoma-like asexual morph are needed to clarify the relationship between Keissleriella and Pleurophoma.
Distribution: Canada, Italy, Japan, Russia, Netherlands, UK (Zalasky 1974, Crous et al. 2014b, Liu et al. 2015, Tanaka et al. 2015, Tibpromma et al. 2017, Wanasinghe et al. 2018).
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.