Xanthoparmelia nebulosa
≡Parmelia nebulosa Kurok. & Filson in R.B.Filson, Austral. J. Bot. 30: 547 (1982).
Description : Thallus loosely to moderately adnate on rock, 6–10 cm diam. Lobes subirregular, strongly imbricate, contiguous or not, 1–2.5(–5) mm wide, apices crenulate, rounded, secondary lobes narrower, to 1 mm wide, imbricate-entangled. Upper surface yellow-green to deep olive-green, blackening with age, glossy, emaculate, wrinkled-cracked with age, without isidia or soredia, lobe margins blackened. Lower surface pale-ivory to brown, moderately rhizinate. Rhizines yellow-brown to brown, slender, simple. Apothecia sessile to subpedicellate, 2–7 mm diam., disc concave, dark-brown; thalline exciple involute at first becoming undulate-cracked. Ascospores 8.5–12 × 5.7 μm. Pycnidia common. Conidia bifusiform, 5–6 × 0.5 μm.
Chemistry : Cortex K−; medulla K−, C−, KC−, Pd−; containing constipatic (tr.), protoconstipatic (tr.), dehydroconstipatic (tr.), pertusaric (tr.) and usnic acids and an unidentified fatty acid. (Elix 1994s: 268).
S: Canterbury (Mackenzie Country), Otago (McPhee's Ridge, Cluden River). On soil with Xanthoparmelia flavescentireagens, X. reptans and X. semiviridis. Known also from SE Australia (Elix 1994s: 268; McCarthy 2003c, 2006).
Australasian
Illustration : Filson (1982: 548, fig. 12A – as Parmelia nebulosa).
Xanthoparmelia nebulosa is characterised by: the terricolous habit; the densely imbricate lobes; rounded lobe apices; a pale lower surface; absence of isidia and soredia; and negative chemical reactions in the medulla.
