Fungalpedia – Note 2883, Keissleriomyces
Keissleriomyces D. Hawksw.
Citation when using this data: Meng QF et al. – Fungalpedia.
Index Fungorum, Faceoffungi, MycoBank, GenBank, Fig 1.
Classification: Ascomycota genera incertae sedis, Fungi.
Keissleriomyces was introduced by Hawksworth (1981b) to accommodate the type species K. sandstedeanus, originally described as Stagonospora sandstedeana by Keissler (1925). The genus is characterized by black, singular, immersed, subglobose, unilocular conidiomata with a distinct ostiole. The conidiogenous cells are enteroblastic, subglobose to short-ampulliform, and polyphialidic, capable of producing up to three conidia. The conidia are dry, broadly fusiform, slightly curved at the base, hyaline, 3-septate, and smooth-walled (Hawksworth 1981b). Initially placed within Sphaeropsidales, Keissleriomyces was later tentatively assigned to Ascomycota genera incertae sedis due to the absence of molecular data (Hyde et al. 2024). Further research is needed to clarify its phylogenetic position.
Type species: Keissleriomyces sandstedeanus (Keissl.) D. Hawksw. (Hawksworth 1981b).
= Stagonospora sandstedeana Keissler (Keissler 1925).
Other accepted species: Species Fungorum – search Keissleriomyces.
Figure 1 – Keissleriomyces sandstedeanus redrawn from Hawksworth (1981b). a Vertical section of pycnidium. b Conidia. Scale bars: a = 20 μm, b = 10 μm.
References
Hawksworth DL. 1981b – The lichenicolous Coelomycetes. Bulletin of the British Museum (Natural History), Botany 9 (1), 1–98.
Keissler K. 1925 – Systematische Untersuchungen Über Flechtenparasiten Und Lichenoide Pilze. (III. Teil), Nr. 21–30. Annalen des Naturhistorischen Museums in Wien, 162–168.
Entry by
Meng QF, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand and School of Public Health, Zunyi Medical University, Guizhou 563000, China.
Published online 24 July 2026