A pale, translucent slug which is greyish-buff colour, and has a pair of dark lines running along its sides. Length 60 to 90mm.
It can be seen all year-long, and is found in on trees, usually in wet weather. It produces large amounts of watery mucous when disturbed as a defence measure. Common and widespread in woodland in W Britain and Ireland.
Photograph taken June 2015, rear garden, Staffordshire. © Pete Hillman 2015. Camera used Nikon D3200, with Sigma 105mm macro lens.