Medulla
medulla (noun, pl. medullas) – an internal layer of fungal hyphae, below the algal layer, in the thallus or in a lecanorine apothecium; hyphae often more or less loosely interwoven and weakly gelatinized, but sometimes anticlinally arranged, densely packed, or strongly gelatinized; sometimes more or less densely filled with granules or crystals, which can be calcium oxalate, silicates, or lichen substances. Related terms: medullary cavity, pilema, medulla rhizine.
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