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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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Other Resources: Flora Australia Fungi, Lichens  •  Glossary at Mushroom  •  Cornell Pl. Path.  •  APS Pl. Path.: A-D E-H I-M N-R S-V W-Z.
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