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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
Parmotrema dilatatum (Vain.) Hale
  Phytologia 28: 335 (1974);
Parmelia dilatata Vain., Acta Soc. Fauna Fl. Fenn. 7: 33 (1890). T: Sitio, Minas Gerais, Brazil, E.A.Vainio, Lich. Bras. Exs. 397; holo: TUR; iso: BM, FH, M, UPS. For additional synonymy see H.Krog & T.D.V.Swinscow, Bull. Brit. Mus. (Nat. Hist.), Bot. 9: 177 (1981).
  Thallus loosely adnate to adnate, coriaceous, to 10–20 cm wide. Lobes rotund, 10–20 mm wide; margins entire or crenate, eciliate. Upper surface yellowish grey, smooth, shiny, emaculate, becoming ±irregularly cracked towards centre, lacking isidia; soralia marginal and linear on peripheral lobes and subcapitate on ascending lateral lobes; soredia granular. Medulla white or pigmented pale yellowish pink. Lower surface black, with a broad, brown, erhizinate marginal zone; rhizines sparse, simple. Apothecia laminal, sessile, 3–10 mm wide; disc imperforate; thalline exciple sorediate. Ascospores 25–27 × 10–12 µm. Pycnidia not seen. CHEMISTRY: cortex K+ yellow; medulla K+ dingy yellow then dirty brown, C-, P+ orange-red; containing atranorin, chloroatranorin, usnic acid, protocetraric acid, echinocarpic acid, conechinocarpic acid, with or without unidentified compounds and secalonic acid A.
  A scattered species on trees and rock in north Qld; also occurs in Africa, India, South America and New Zealand.  
  Elix (1994t)  

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

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