Local in oak woodland throughout much of the British Isles. In south Hampshire, reasonably common in the New Forest and at Botley Wood, with scattered records elsewhere and in the north of the county, where its stronghold is in Pamber Forest; very rare on the Isle of Wight. Wingspan 10-13 mm. Distinguished from
P. giganteana by its smaller size, the broader and subquadrate medio-dorsal blotch and in the male by the heavy, sharply demarcated blackish brown border of the hindwing [Bradley]. Larva feeds within the bark of Oak, forming galls.