Xanthoparmelia streimannii
≡Parmelia streimannii Elix & P.M.Armstr., Austral. J. Bot. 31: 481 (1983).
Description : Thallus loosely adnate on rocks, yellowish green, darkening with age, radiating at first but becoming irregularly lobate, 4–7 cm diam. Lobes imbricate or not, sublinear-elongate, 0.5–1.5(–2) mm wide, older lobes irregularly fractured and becoming areolate. Upper surface matt, emaculate, commonly with tangential cracks, densely isidiate. Isidia cylindrical at first, becoming coralloid-branched. Lower surface pale-brown darkening near apices, moderately rhizinate. Rhizines simple, brown. Apothecia sessile, to 5 mm diam., disc concave to plane, dark-brown; thalline exciple isidiate. Ascospores 7–9 × 5–6 μm.
Chemistry : Cortex K−; medulla K+ yellow→red, C−, KC+ red, Pd+ yellow; containing connorstictic, norstictic, ±salazinic and usnic acids.
N: Northland (Three Kings Is), Auckland (Karekare), Gisborne (Te Kaha). S: Nelson (S of Farewell Spit). On exposed rocks and clay banks, coastal. Known also from Australia (Elix 1994s: 287; McCarthy 2003c, 2006).
Australasian
Illustrations : Elix & Armstrong (1983: 482, fig. 11 – as Parmelia streimannii); Elix (1994s: 288, fig. 104C); Kantvilas et al. (2002: 231).
Xanthoparmelia streimannii is characterised by: the saxicolous/terricolous habit; the extensively branched, coralloid, cylindrical isidia; the pale lower surface; and norstictic and connorstictic acids in the medulla.
