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Medulla (lichenology)

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Medulla (lichenology)

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.[1] The medulla generally has a cottony appearance. It is the widest layer of a heteromerous lichen thallus.


  1. ^ Galloway, D.J. (1992). Flora of Australia - Lichen Glossary
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