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Biscogniauxia nummularia symptoms on beech trunk (click on image to enlarge it)
Author(s): Roger Griffith
Source: Wikimedia Commons


This order of fungi contains more than 20 families and about 800 species of saprophytic and plant pathogenic species. The stromata are well developed and the perithecial ascomata have thick walls. The asci are unitunicate, contain 8 spores and have an apical ring. The ascospores are characterized by a prominent germ slit. The classification of which families are placed within this order is based on the sequence of the small subunit ribosomal DNA (18S rDNA).

This page only deals with plant pathogenic species, for beneficial groups of Xylariales see:

The following genera and individual species are currently entered under Xylariales: