An areola, or a similar form of a space surrounded by something of a different colour.

plural of areolation

Having areolas / (biology, mycology) Having a pattern of block-like areas similar to cracked dried mud

plural of areola

(botany) The smallest enclosures created by the veins of a leaf. / (botany) Bump on a cactus out of which grow clusters of spines. / (mycology) A tessellation in the thallus of certain lichens.

Divided into small spaces or areolations, as the wings of insects, the leaves of plants, or the receptacle of compound flowers.