Trapelia coarctata is a lichenised fungus in the family, Trapeliaceae.[1]
It was first described as Lichen coarctatus in 1799 by Dawson Turner in Smith & Sowerby's, English Botany.,[1] [2] and transferred to the genus, Trapelia by Maurice Choisy in 1932.[1] [3]
It has been found in mallee woodland dry sclerophyll forest, on soil and rocks,[4] in Western Australia, and on Kangaroo Island in South Australia.[4] [5] It has a continuous grey thallus, containing gyrophoric acid, and is a first coloniser after fire. It was among the first lichen species to be found on Surtsey island after its inception from the sea.