One of the mysteries of the English language finally explained.
With singular concord: a former class of fungi (now called Sordariomycetes), constituting a subgroup of the Ascomycota characterized by having the asci enclosed in flask-shaped fruiting bodies (perithecia). Treated as plural (also pyrenomycetes): members of this class collectively.
Mid 19th century; earliest use found in Arthur Henfrey (d. 1859), botanist. From scientific Latin Pyrenomycetes from ancient Greek πυρήν fruit stone + post-classical Latin -o- + Mycetes.
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