Flora of New Zealand Series

≡Lecanora allorhiza Nyl., Flora 51: 373 (1868).

≡Psoroma allorhizum (Nyl.) Hue, Nouv. Archs Mus. Hist. Nat. Paris sér. 3,3: 45 (1891).

=Physcia regalis Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss. Kl. 104: 379 (1941).

Lectotype: New Zealand. Sine loco [probably Wellington], Charles Knight s.n. – H-NYL 30795 [fide Galloway (1985a: 468)].

Physcia regalis. Holotype: New Zealand. Auckland, Rangitoto I., on Metrosideros tomentosa in light forest, H.H. Allan A105 – W.

Description : Flora (1985: 467–468 – as Psoroma allorhizum).

Chemistry : Vicanicin and (±) allorhizin (Elix et al. 1982: 2328).

N: Northland (Omanaia), Auckland (Waitakere Ra.), Wellingon (Kapiti I.). S: Nelson (Mt Robert, Te Rata), Otago (Hidden Falls), Southland (Milford Sound, Doubtful Sound, Five Fingers Peninsula, Dusky Sound. St: (Moturau Moana, Butterfield's Beach, Freshwater Valley, Wilson Bay, Port Pegasus). C: On bark of trees and shrubs, more rarely on rock. Mainly lowland and coastal, but also occasionally inland.

Endemic

Illustrations : Malcolm & Galloway (1997: 107, 135 – as Psoroma allorhizum); Malcolm & Malcolm (2000: 40, 106 – as Psoroma allorhizum).

Pannaria allorhiza is characterised by: the corticolous (rarely saxicolous) habit; the relatively long, parallel lobes, with the central parts of the thallus having short, swollen, glomerulate isidia; the upper surface distinctly fibrous and sometimes areolate–scabrid in patches; rather rare, globose-gomerulate, clustered cephalodia, 1–3 mm diam., on the lower surface; central apothecia, 1–5 mm diam., the disc pale to dark red-brown, occasionally fissured or with small, thalline lobules and with a striate–contorted but not isidiate margin; ellipsoidal ascospores, 15–22 × 11–12 μm; and vicanicin as a major secondary compound. It has a green alga as major photobiont.