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
Koordersiella Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 118: 833 (1909)
Synonyms listed in Index Fungorum (2019), Ascohansfordiellopsis D. Hawksw., Keratosphaera H.B.P. Upadhyay, Phanerococcus Theiss. & P. Syd. (not confirmed in this study).
Saprobic on leaves of Urostigma vogelii Miq. Sexual morph: Ascomata regular, small, subglobose to globose, scattered, slightly carbonaceous. Peridium thick, carbonaceous. Hamathecium numerous, filamentous, septate, branched, anastomosing, trabeculate pseudoparaphyses. Asci 8-spored, fissitunicate, cylindrical to clavate, with a short pedicel or sessile, rounded at the apex, with an ocular chamber. Ascospores bi or tri-seriate, straight or slightly curved, fusiform to cylindrical, spindle-shaped, and rounded at both ends or slightly pointed, 4–8 celled, multi-septate, hyaline, without a gelatinous sheath. Asexual morph: Undetermined.
Type species – Koordersiella javanica Höhn.
Notes – The lichenicolous genus Koordersiella was introduced by Höhnel (1909) to accommodate type species Koordersiella javanica. The latter was found on leaves of Urostigma vogelii Miq. in Java. The genus is characterized by regular, small black perithecia, with a multi-layered perithecial wall. Asci are thin-walled, sessile consisting of four to eight spores. Ascospores are hyaline, cylindric spindle-shaped. Hawksworth (2016) considered the type species of Koordersiella, K. javanica, and the type species of Hansfordiellopsis, H. aburiensis (now regarded as a synonym of K. insectivora), to be congeneric. Currently, three species are accommodated in the genus Koordersiella (Wijayawardene et al. 2014). The asexual morph is unknown. Koordersiella was placed in Dothideomycetes genera incertae sedis (Lumbsch & Huhndorf 2010, Kirk et al. 2013, Rossman et al. 2016). Cultures and sequences are unavailable. We illustrate the characters of the genus Koordersiella by re-examining the type specimen under the code FH 00301501 from FH herbarium. The type species of Koordersiella seems to resemble species of Lophiotremataceae in having small ascomata, clavate asci, and several septate hyaline ascospores. Thus, we tentatively place the genus Koordersiella in Lophiotremataceae based on morphology until further re-collected.