Degelia duplomarginata (P.James & Henssen) Arv. & D.J.Galloway
Parmeliella duplomarginata P. James et Henssen, Mycotaxon 11: 221 (1980).
Holotype: New Zealand. South Auckland. Rotoiti Bush, SE of Lake Rotoehu. G.E. and Greta Du Rietz 3117, 19.5.1927, S!
Thallus ± orbicular to spreading, loosely attached, or sometimes closely attached, 5-8(-12) cm diam. Lobes whitish-grey to leaden grey when dry, darker bluish-grey when wet, 0.3-0.6(-1) cm wide, adjacent often imbricate, broadly cuneate to flabellate, apices rounded, margins entire or occasionally minutely notched or incised, ± deflexed. Upper surface smooth or minutely wrinkled, rather coriaceous, matt, without isidia, usually with transverse, concentric ridges, often with regenerating lobules in older parts of the thallus. Lower surface usually pale but sometimes dark, with a dense felt of rhizines usually arranged in concentric lines. Rhizines whitish, often turning bluish or entirely black, usually not projecting beyond lobe margins. Apothecia ± frequent, to 2 mm diam., disc concave when young, becoming plane or rarely slightly convex when old, reddish-brown, sometimes blackened, with a double margin, proper margin prominent in young apothecia, rising above the disc, visible in old apothecia only as a pale or rarely dark line, or completely occluded by thalline margin, thalline margin crenulate, or ± fused, small flattened lobules arising from base of the apothecia. Ascospores 11-15 × 6-8 µm.
N: King Country to Lake Rotoiti and Mt Egmont. S: Nelson to Fiordland, mainly in western coastal, or mountainous areas east of the Main Divide. A:
Paleotropical
D. duplomarginata is found in high-rainfall areas close to, or west of the Main Divide in South I., and in moist humid areas, primarily on successional vegetation in altered habitats in North I., being most common on shrubs on the Volcanic Plateau. It is most commonly an epiphyte of the following: Coprosma, Dracophyllum, Griselinia, Leptospermum, Myrsine, Nothofagus, Pseudopanax and Weinmannia. Rarely on boulders in open forest or scrub, s.l. to 1150 m.
