ascocarp margin (noun, pl. margins;ascocarp term) – a morphological term referring to a rim formed around an ascocarp; this margin is either coloured and textured like the hymenium surface and ontogenetically derived from hyphae that are part of the apothecium (proper margin, true margin), or, it is (mostly) the same colour and texture as the surrounding thallus and thus developed from this surrounding thallus (thalline margin). Internally the anatomy of the margin usually corresponds with this external morphology. Related terms: proper margin, thalline margin, pseudothalline margin, thalline collar, thalline veil, exciple, lecanorine, lecideine, biatorine. This is:part of ascocarp.