Available online xxxKeywords: Pyrenomycete Stromal anatomy Xylariaceae a b s t r a c t The conspicuous concentric zonation occurring in stromata of species of Daldinia, based on studies on D. concentrica and D. eschscholtzii, is shown to result from a regular alternation of the orientation of the hyphae. The rings are all produced within a single growing season.There is no evidence to suggest that they are a result of successive abortion of perithecia.
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