Irish lichens

Trapelia coarctata

Order: Agyriales       Family: Agyriaceae

Species: Trapelia coarctata

Growth type crustose.
Photos: On rocks. Gougane Barra, Cork, SW Ireland.
Identified by John Douglass

Very variable. Thin, +/- smooth, white, bluish-grey or pink-grey thallus with +/- contiguous areoles. Apothecia pink to red-brown, the thin white margins often excluded with age.

Abundant on siliceous rocks, stones, bricks, mortar, occasionally on consolidated clay. K-, C+ red, KC+ red, P-, UV+ whitish.

Similar: T. glebulosa and T. placodioides


Trapelia coarctata


Trapelia coarctata


Trapelia coarctata
Trapelia coarctata. August 2009

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