Sulphur Dust Lichen – Psilolechia lucida

A leprose lichen which ranges from bright green to yellow-green to sulphur yellow in colour. Generally powder thin, but can be thicker in places which cracks. Apothecia rare.

Found in sheltered, dry places on sandstone rock overhangs, dry-stone walls and on man-made stone or brick. Rarely found on bark. Common and widespread throughout Britain.