Aceria pseudoplatani

Aceria pseudoplatani is a gall mite that causes a gall to form on the leaves of Sycamore. The upper surface of the gall is usually distinct and yellowish, with or without a bulge; the underside is white or cream when fresh, browning with age. The gall is seen more frequently than the mite that causes it.

On the leaves of Sycamore.

Summer when the leaves are present on Sycamore.

Widespread and quite common in Britain.

Fairly frequent in Leicestershire and Rutland.