transport of water, ions and plant hormones.

Lichen

On a lichen, the cortex is also the surface layer or "skin" of the nonfruiting part of the body of some lichens. It is the "skin", or outer layer of tissue, that covers the undifferentiated cells of the . Fruticose lichens have one cortex encircling the branches, even flattened, leaf-like forms. Foliose lichens

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