Trapelia coarctata Agyriaceae
Trapelia coarctata

Growth type crustose
Chemical results: K-, C+ red, KC+ red, P-, UV+ whitish.

Can be abundant on siliceous rocks and stones, bricks and mortar, sometimes found on consolidated clay soils.

Very variable. Pink to reddish-brown apothecia, thin white margins often excluded with age, on a thin, +/- smooth, white, bluish-grey or pink-grey thallus. When present prothallus is whitish. Spores simple, 15-25 x 7-13 Ám. Microscope photograph below.
Sometimes host to Lichenochora coarctatae and Roselliniella microthelia

Similar: Trapelia glebulosa and Trapelia placodioides


Trapelia coarctata


Trapelia coarctata

Microscope photograph
Trapelia coarctata
Trapelia coarctata
Brands Bay, Dorset. January 2013

All images used are copyright. Please contact me if you find errors.