Toninia caeruleonigricans sensu auct. non (Lightf.) Th.Fr.
Lichen caeruleonigricans Lightf., Fl. scotica 2: 805 (1777).
Thallus determinate, squamulose. Squamules convex, pale brown, glaucous- or bluish-black, densely white-pruinose or bluish-grey pruinose, imbricate, sometimes scattered, round-lobed at margins. Apothecia sessile, frequent, convex, to 5 mm diam., black, with a grey pruina, marginate at first becoming immarginate with age. Ascospores 1-septate, subfusiform or subacicular, 11-30 × 2-4 µm.
N: Sine loco. W. Colenso 3037, (BM). Growing on limestone with Fulgensia fulgens.
Cosmopolitan
