Lecanora atra (Huds.) Ach.
Lichen ater Huds., Fl. angl. 1: 445 (1762).
Lecanora pachypolis Nyl. in Leighton, J. Linn. Soc. Lond. Bot. 10: 32 (1869).
L. platylepis Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss. Kl. 104: 338 (1941).
L. pachypolis. Lectotype: New Zealand. Napier ad saxa. Colenso 6350, ex Herb. Leighton, BM!
L. platylepis. Lectotype: New Zealand. Otago, Mt Pisgah c. 800 m on schist rocks. J.S. Thomson 47, CHR 345806!
Thallus grey to whitish-grey or creamish, smooth or warted-areolate, plicate, rugose, areolae, 1-3 mm diam., separated by gaping cracks or ± continuous, uneven, effuse or lacking, matt or slightly shining, Apothecia conspicuous, scattered to frequent, sessile, constricted at base, 0.2-3 mm diam., rounded to subirregular, disc black, matt or shining, epruinose, concave to plane to ± undulate-irregular to convex, thalline margin conspicuous, persistent, white, entire or crenulate or flexuose, inflexed when young. Epithecium dark red-brown 8-13 µm thick, dense. Hymenium dark brown, to 120 µm thick. Paraphyses thick, dense, 5-7 µm thick, apices capitate, 8.5 µm thick, dark brown. Asci globose to clavate, 52 × 17.4 µm. Ascospores biseriate, often difficult to find, ellipsoid, 10-15 × (5-)6-8 µm. Chemistry: Atranorin and α-collatolic acid.
N: S: St: Throughout, on coastal and inland rocks and on bark and twigs of forest trees and shrubs, especially common on canopy branches of Nothofagus menziesii and N. solandri var. cliffortioides, also among mosses in rock crevices in subalpine and alpine habitatats, s.l. to 2000 m.
Cosmopolitan
