Trapelia coarctata (Turner ex Sm.) M.Choisy
Lichen coarctatus Turner in Sm. et Sowerby, Engl. Bot. 8: tab. 554 (1799).
Thallus rather smooth, green-white, grey or brown often tinged pinkish, continuous, cracked-areolate or with areolae dispersed and ± squamulose at margins. Apothecia 0.2-2 mm diam., round, scattered, disc red-brown to brown- black, ± roughened, sometimes with a pseudothalline margin caused by its eruption through the thallus, part of which may remain adhering. Ascospores ellipsoid, 14-17 × 7-10 µm. Chemistry: Cortex C+ red. Gyrophoric acid.
N: Three Kings Is. Wellington (Knight, BM). S: Otago (Green Island Bluff, W.L. Lindsay, Oct. 1861, BM, E). Coastal rocks and cliffs and on soil; still poorly collected.
Cosmopolitan
