The difference between Crustose and Microlichen
Crustose is also adjective with the meaning: of a lichen, growing tightly appressed to the substrate.
Microlichen is also noun with the meaning: any lichen with a very small thallus, resulting in a two-dimensional appearance.
check bellow for the other definitions of Crustose and Microlichen
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Crustose as an adjective (lichenology):
Of a lichen, growing tightly appressed to the substrate.
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Microlichen as a noun:
Any lichen with a very small thallus, resulting in a two-dimensional appearance.