Thalline margin

thalline margin (noun, pl. thalline margins;ascocarp term) – a morphological term referring to a rim formed by the thallus around a lecanorine apothecium; similar in colour, texture and appearance to the surrounding thallus and not the disk; present only in some, but not all, lichenized ascomycetes; corresponds internally to the thalline exciple or amphithecium. This is:part of ascocarp.

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