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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
Flavoparmelia helmsii (Kurok. & Filson) Hale
  Mycotaxon 25: 605 (1986); Parmelia helmsii Kurok. & Filson in R.B.Filson, Austral. J. Bot. 30: 539 (1982). T: Everard Ranges, S.A., 1 June 1891, R.Helms 33; holo: MEL.  
  Thallus adnate, to 5–10 cm wide. Lobes imbricate, 1–3 mm wide; margins crenulate; apices rotund. Upper surface dark green to yellow-green, ±rugulose at lobe margins, becoming densely rugulose towards centre, dull to slightly shiny, lacking soredia, dactyls and isidia. Medulla white. Lower surface with sparse, simple rhizines. Apothecia sessile, 2–6 mm wide, crowded at thallus centre; disc concave, cinnamon-brown to dark brown; thalline exciple involute, rugulose. Ascospores 14–18 × 6–9 µm. Pycnidia common. Conidia bacilliform or slightly curved, 8–9 × 1 µm. CHEMISTRY: cortex K-, UV-; medulla K+ very faint brown, C-, KC+ pale brownish orange, P-; containing usnic acid, barbatic acid (major), 4-O-demethylbarbatic acid (trace), ±atranorin and caperatic acid.
  Rare, endemic, occurs on bark of trees in central Australia (S.A.).  
  Elix (1994g)  

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

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