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|Noun||1.||class Pyrenomycetes - class of fungi in which the fruiting body is a perithecium; includes powdery mildews and ergot and Neurospora|
class - (biology) a taxonomic group containing one or more orders
order Sphaeriales, Sphaeriales - large order of ascomycetous fungi usually having a dark hard perithecia with definite ostioles; in more recent classifications often divided among several orders