Abstract
The classes Orbiliomycetes and Pezizomycetes are early diverging lineages in the Pezizomycotina. The Orbiliomycetes, with a single order and single family, produce small ascomata, small unitunicate asci that open without an operculum, and minute ascospores. They are saprobic or predaceous on invertebrates. The order exhibits a range of conidial states, all of which develop holoblastically. Some of the anamorphs are found routinely in aquatic habitats. The Pezizomycetes are organized under a single order with 13 families. Families are distinguished based on characters of the asci, ascospores, and general morphology of the ascomata. Many members are mycorrhizal. Saprobes occur on plant material and dung. There are a few plant parasitic species. Of note in the class is the multiple origin of hypogeous taxa, nearly all of which occur within clades that are known to be mycorrhizal. Mitosporic states developing holoblastically are known in most families.
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Pfister, D.H. (2015). 2 Pezizomycotina: Pezizomycetes , Orbiliomycetes . In: McLaughlin, D., Spatafora, J. (eds) Systematics and Evolution. The Mycota, vol 7B. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46011-5_2
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