The difference between Crustose and Foliose
When used as adjectives, crustose means of a lichen, growing tightly appressed to the substrate, whereas foliose means leafy or leaf-like.
check bellow for the other definitions of Crustose and Foliose
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Crustose as an adjective (lichenology):
Of a lichen, growing tightly appressed to the substrate.
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Foliose as an adjective:
leafy or leaf-like.