Toninia tumidula (Sm.) Zahlbr.
Lichen tumidulus Sm., Trans. Linn. Soc. Lond. 1: 82 (1791).
Thallus subdeterminate, thickish, warty or areolate-squamulose, crowded or dispersed, saxicolous or terricolous. Areolae sublobate, plicate, turgid, wrinkled or cracked, whitish to yellowish-brown, often white-pruinose. Apothecia sessile on margins of areolae, disc plane and thinly marginate, becoming convex and immarginate, often confluent, black, epruinose. Hypothecium red-brown. Spores 1-septate, oblong, 12 × 6 µm.
N: Sine loco. W. Colenso 2907, (BM). S: Clifden. On limestone rocks, on which it is probably more widely distributed than records show.
Cosmopolitan
