Psoroma sphinctrinum (Mont.) Nyl.
Parmelia sphinctrina Mont., Annls Sci. nat. Bot. sér. 2, 4: 90 (1835).
Psoroma discretum Nyl., Lich. N.Z.: 52 (1888).
P. pyxinoides Nyl., Lich. N.Z.: 53 (1888).
Pannaria beata Hue, Nouv. Archs Mus. Hist. nat. Paris. sér. 4, 8: 264 (1906).
P. laciniata Zahlbr., Denkschr. Akad. Wiss. Wien math.-naturwiss. Kl. 104: 275 (1941).
P. discretum. Lectotype: New Zealand. Greymouth. Richard Helms 188, 1886, H-NYL 30765!
P. pyxinoides. Lectotype: New Zealand. Sine loco (prob. Wellington). Charles Knight 62, H-NYL 30804!
Pannaria laciniata. Holotype: New Zealand. Rangitoto I: On Griselinia lucida. H.H. Allan W4, W!
Thallus foliose-lobate, closely attached, ± rosette-forming, to 20 cm diam., with a black, fibrous prothallus visible at margins. Lobes rather narrow, to 2 mm wide and 6-10 mm long, discrete or imbricate centrally, margins entire, ± narrowly tapering or ± bifurcate at apices, flat or slightly undulating, thickened below. Upper surface bright lettuce-green, becoming cinnamon-brown on storage, smooth, matt, margins slightly darker, shining, epruinose, not scabrid or tomentose, sometimes ± cracked, ± coriaceous. Lower surface pale buff-brown, with dense, buff or brown tomentum and rhizines almost to margins. Cephalodia flattened, placodioid, to 2 mm diam., marginal and laminal, simple, globose at first, becoming wrinkled-plicate. Apothecia frequent, often crowded, sessile or subpedicellate, round to irregular, to 5 mm diam., disc red- brown or orange, often gyrose-etched, darker centrally, often with concentric rings or ridges, epruinose, margins thick, crenulate-striate. Ascospores ellipsoid- fusiform, 11-20 × 8-11 µm.
N: S: St: A: Throughout on bark of forest trees and shrubs, coastal and lowland to subalpine, s.l. to 1000 m. A common and widespread species in areas of moderate to high rainfall.
Austral
P. sphinctrinum is rather variable and may well be separable into several component species, however, until more is known of the distribution and chemical constituents of the various morphodemes involved, a single taxon is maintained here.
