Thalline collar
thalline collar (noun, pl. thalline collars;ascocarp term) – a morphological term referring to an indistinctly differentiated rim of irregularly aggregated thalline material more or less loosely associated with the proper margin of a lecideine apothecium, resembling a thalline exciple, but much more irregular and lacking a distinctly differentiated anatomy of a true thalline exciple; present for example in Buellia (Diplotomma) alboatra. This is:part of ascocarp.
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