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Australian Biological Resources Study

Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Degelia duplomarginata (P.James & Henssen) Arv. & D.J.Galloway
  Lichenologist 13: 39 (1981)
Parmeliella duplomarginata P.James & Henssen, Mycotaxon 11: 221 (1980). T: SE of Lake Rotoehu, Rotoiti Bush, S Auckland, N.Z., 19 May 1927 G.E. & G.Du Reitz 3117; holo: UPSV; iso: BM, MB.
  Thallus ±foliose, orbicular, loosely attached, to 8 cm wide, leaden grey to bluish when wet. Lobes 0.3–0.6 cm wide, adjacent to somewhat imbricate, broadly cuneate, with deflexed, ±entire margins. Upper surface matt, usually with transverse concentric ridges, without isidia but often with regenerating lobules in older parts of thallus. Lower surface pale, densely beset with rhizohyphae, often turning bluish or black. Apothecia frequent, to 2 mm wide; disc concave, becoming flat, usually reddish brown; proper exciple distinct, paler; thalline exciple variously developed, of secondary lobules arising from apothecium base, forming a crown-like structure; hymenium I+ blue. Ascospores simple, ellipsoidal, 10–15 × 6–9 µm, hyaline. Pycnidia usually frequent. Conidia 2–3 × 1 µm.
  Very rare, known in Australia from a single collection; occurs on bark, apparently restricted to wet forests in Tas. Also in New Zealand, Hawai'i and southern South America.  
  Jørgensen & Galloway (1992a)  

Checklist Index
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References

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