speckled or dotted areas on foliage or bark.
stippling (Wikipedia)
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Capodimonte porcelain jar painted in the stipple style of Giovanni Caselli with three figures of Pulcinella from the commedia dell'arte, 1745-50.
Stippling is the creation of a pattern simulating varying degrees of solidity or shading by using small dots. Such a pattern may occur in nature and these effects are frequently emulated by artists.