A small crustose epiphyte with a red-brown thallus. The tiny, tight mosaics of orange, fleck-like (or concave) soralia are a key characteristic. Fairly common with a north-west distribution in Britain

References: 
Smith, C.W. et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson, F.S. (2018) Lichens: an Illustrated Guide to the British and Irish Species