Puneet Varma (Editor)

Medulla (lichenology)

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The medulla is a horizontal layer within a lichen thallus. It is a loosely arranged layer of interlaced hyphae below the upper cortex and photobiont zone, but above the lower cortex. The medulla generally has a cottony appearance. It is the widest layer of a heteromerous lichen thallus.

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Medulla (lichenology) Wikipedia