Flora of New Zealand Series

X. flavescentireagens (Gyelnik) D. Galloway, N.Z. J. Bot. 18: 533 (1981).

Parmelia flavescentireagens Gyelnik, Feddes Repert. 36: 154 (1934).

Thallus foliose, loosely attached to adnate, to 10 cm diam. Lobes ± rounded at margins, 2-6 mm wide, linear-laciniate centrally, margins entire, subcrenate to ± incised, shining, brown or black. Upper surface smooth, shining, yellow to pale greenish-yellow, maculae, isidia and soredia absent. Lower surface pale brown with a narrow marginal zone which is darker, rhizinate. Rhizines simple, pale or brown, thick, numerous. Apothecia rare, subpedicellate, to 6 mm diam., disc brown, shining, imperforate, concave to plane, margins thick, entire or crenulate, concolorous with thallus, thalline exciple smooth, shining. Pycnidia occasional to common on fertile plants only, black, crateriform. Chemistry: Cortex K-; medulla K-, C-, KC+ pink, Pd-. Norlobaridone, loxodin and usnic acid.

N: East coast near Napier. S: Eastern coastal and inland habitats from Marlborough to Otago. Mainly saxicolous or on pebbles and soil in landslips and riverbeds; lowland to alpine. Rarely on wood.

Australasian

Variation is discussed by Galloway ( loc. cit., p. 533).