Caverna
From LIAS Glossary
caverna (noun, pl. cavernae; synonym: cavernula) – a cavity; (1) thallus surface: a cavity or hollow area, particularly in the lower cortex of the foliose lichen genus Cavernularia; (2) the central cavity inside a pycnidium or perithecium. This is:part of thallus surface,part of thallus interior.
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