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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 praesorediosum (Nyl.) Hale
  Phytologia 28: 338 (1974);
Parmelia praesorediosa Nyl., Sert. Lich. Trop. 18 (1891). T: Singapore, 30 Nov. 1879, E.Almquist; holo: H-NYL; iso: S, n.v., fide M.E.Hale, Contr. U.S. Natl Herb. 36: 258 (1965). For further synonymy see M.E.Hale, loc. cit. (1965).
  Thallus adnate, coriaceous, to 5–10 cm wide. Lobes rounded, 4–8 (–10) mm wide; margins entire or crenate, eciliate, suberect and sorediate. Upper surface pale grey, dull, emaculate, smooth, becoming slightly rugose and cracked in older parts, lacking isidia; soralia marginal, linear to crescent-shaped, sometimes becoming submarginal and punctiform to subcapitate. Medulla white. Lower surface black, with a mottled, ivory or brown, erhizinate marginal zone; rhizines sparse, simple, short. Apothecia rare, pedicellate, 4–10 mm wide; disc imperforate; thalline exciple rugose, sorediate. Ascospores 15–21 × 7–10 µm. Pycnidia rare. Conidia sublageniform, 7–8 × 1 µm. CHEMISTRY: cortex K+ yellow; medulla K-, C-, KC-, P-; containing atranorin, chloroatranorin, protopraesorediosic acid (major), praesorediosic acid (major) and unidentified fatty acids (minor).
  A very common species in tropical Australia, in fairly dry, open sites (W.A., N.T. and Qld); also occurs in eastern and southern Africa, North, Central and South America, India, Indonesia (Sumatra, Java), Papua New Guinea, New Caledonia and Fiji. Grows on bark and rock.  
  Elix (1994t)  

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

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