Flora of New Zealand Series

B. tholera Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss. K1. 104: 316 (1941).

Lecidea trachona var. marginatula Nyl., Flora 48: 339 (1865).

Holotype: New Zealand. North Auckland, Hen I., on shaded rock in forest. L.B. Moore ZA 18, W!

Lecidea trachona var. marginatula. Lectotype: New Zealand. Otago, Green Island Bluff, on columnar basalt, October 1861. W.L. Lindsay, E!

Thallus greyish, greyish-yellow or olivaceous, areolate-cracked or uneven, in patches 1-3(-5) cm diam. Apothecia sessile, constricted at base, 0.3-0.8(-1.5) mm diam., disc plane or subconvex, black or brownish, shining, epruinose, margins thin, black, entire. Hymenium 60 µm tall, pale purplish-grey. Hypothecium and exciple dark purplish, K+ purple-violet. Ascospores oblong-fusiform, 3-septate, 14-18 × 4-6 µm.

N: North Auckland. S: Otago. Lowland, coastal on rock.

Endemic