plural noun

Definition of Sphaeriales 

: a large order of ascomycetous fungi (subclass Euascomycetes) that usually have hard dark perithecia with definite ostioles, that include many economically important plant parasites as well as large numbers of saprophytes, and that in recent classifications are often divided among several orders

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History and Etymology for Sphaeriales

New Latin, from Sphaeria + -ales

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