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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
Pannaria obscura Müll.Arg.
  Bull. Herb. Boissier 4: 91 (1895)
T: Lorne R., Vic., F.R.M.Wilson 523; holo: G.
  Thallus orbicular to irregularly spreading, 1–5 cm wide, closely attached. Lobes radiating, rather narrow, 1–3 mm wide, 5–10 mm long, usually adjacent to ±imbricate with wavy often subascendant, distinctly thickened margins. Upper surface smooth and ±shining, or partly strongly white-pruinose, especially at lobe apices, grey-blue to brownish. Lower surface densely covered with brownish rhizohyphae, pale buff to brownish. Cyanobiont Nostoc, in clusters. Apothecia ±common, laminal, sessile, 0.5–1 mm wide; disc flat to convex, red-brown to almost black; thalline exciple prominent, crenate to subimbricate. Ascospores 10–15 × 5–8 µm, thick-walled with rugulose exosporium. CHEMISTRY: P+ orange-yellow. Vicanicin, norvicanicin and ±ursolic acid.
  Occurs on bark. A species apparently endemic in Australia in widely disjunct localities in southern W.A., S.A. and Vic. A species of dry, open lowland woodland.  
  Jørgensen & Galloway (1992a)  

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

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