Trabecula
trabecula (noun, pl. trabeculae) – plate-like (flattened; often appearing shredded) structures (extensions from the lower cortex) on the underside of Umbilicaria thalli; used in quite different senses in non-lichenized fungi. {Question: which sense?} Attention: the term is very similar to trabercula (spelt with an "r"), which refers, however, to a particular kind of hyphae, the paraphysoids. This is:part of thallus surface,part of thallus interior.
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