Definition of "pyrenomycetes" []

• An order of ascomycetous fungi of parasitic or saprophytic habit, with the tissues usually hard and somewhat coriaceous.

The Century Dictionary (Public Domain)

• "Those which vegetate most luxuriantly there are the _fungi_, and among them especially the _pyrenomycetes_, which are frequent in the waters of mines."
• "Gnomoniopsis are leaf and stem inhabiting pyrenomycetes that infect plants."