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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 eurysacum (Hue) Hale
  Phytologia 28: 336 (1974);
Parmelia eurysaca Hue, Nouv. Arch. Mus. Hist. Nat., sér. 4, 1: 194 (1899). T: Mexico, 1865–1866, E.Bourgeau s.n.; holo: PC, n.v., fide M.E.Hale, Contr. U.S. Natl Herb. 36: 290 (1965).
  Thallus loosely adnate, coriaceous, to 10–20 cm wide. Lobes flat, rotund, irregular, 8–14 mm wide, conspicuously lobulate-laciniate towards thallus centre; laciniae 5–10 mm long, 1–2 mm wide; cilia prominent, 1–4 mm long. Upper surface ashy white to grey, flat, dull, emaculate, becoming reticulately cracked, lacking soredia and isidia. Medulla white. Lower surface black in centre, with a broad, brown, shiny, erhizinate marginal zone; rhizines slender, simple or bifurcate. Apothecia rare, subpedicellate, 5–15 mm wide; disc perforate; thalline exciple rugose, white-maculate. Ascospores 12–16 × 8–10 µm. Pycnidia common. Conidia bacilliform to short-filiform, 8–10 × 1 µm. CHEMISTRY: cortex K+ yellow; medulla K+ yellow then red, C-, P+ orange-red; containing atranorin, chloroatranorin, salazinic acid and consalazinic acid.
  Rare on rock and trees in hinterland areas of north Qld; also known from North and Central America and East Africa.  
  Elix (1994t)  

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

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