It seems an obvious statement but the study of leaf-mines is a somewhat specialist area of the natural history spectrum. Nonetheless having checked the leaf-mines website this one on hart's tongue fern appears to have been 'dig' by the larvae of the fly Chromatomyia scolopendri and something of an unusual occurrence west of the Wye Valley. This one was found today on the edge of a limestone quarry near to Lasgarn Wood, Abersychan.
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