The difference between Crustose and Fruticose
When used as adjectives, crustose means of a lichen, growing tightly appressed to the substrate, whereas fruticose means having woody stems and branches.
check bellow for the other definitions of Crustose and Fruticose
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Crustose as an adjective (lichenology):
Of a lichen, growing tightly appressed to the substrate.
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Fruticose as an adjective (of a plant):
Having woody stems and branches; shrubby