Canoparmelia pustulescens
≡Parmelia pustulescens Kurok. in M.E. Hale & S. Kurokawa, Contr. U. S. Natnl Herb. 36: 156 (1964).
Description : Thallus adnate to tightly adnate, 2–5 cm diam. Lobes moderately imbricate, sublinear to subirregular, 0.5–2 mm wide, apices often truncate. Upper surface whitish grey, flat, smooth or becoming wrinkled, continuous or becoming cracked with age, pustulate-isidiate. Isidia coarse, short, cylindrical to irregularly inflated, bursting open apically and becoming coarsely sorediate. Medulla white. Lower surface black with a brown marginal zone. Rhizines sparse, simple, black. Apothecia sessile, 1–2 mm diam., disc concave, dark-brown, exciple pustulate. Ascospores 7–9 × 4– 5 μm. Pycnidia rare. Conidia weakly bifusiform, 5–6 × 1 μm.
Chemistry : Cortex K+ yellow; medulla K−, C−, KC−, Pd−; containing atranorin, chloroatranorin, sekikaic acid (major), homosekikaic acid (minor) and fatty acids.
N: Northland (Whangarei). On bark of kauri (Agathis australis). Known also from Australia (McCarthy 2003c, 2006).
Pantropical
Illustration : Hale (1976: 40, fig. 14f).
Canoparmelia pustulescens is characterised by: the pustulate-isidiate upper surface; and sekikaic acid in the medulla.
