Microscopic hymenial characters such as the form of cystidia, the structure of paraphyses, and the type of ascus or basidium remain widely used in identification and taxonomy. In lichenised fungi, especially apotheciate lichens, the hymenium is commonly described together with adjacent tissues such as the and .

Definition

The hymenium is the tissue layer in which sexual spores are produced in many ascomycete and basidiomycete fruiting bodies. In a typical

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