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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
Letrouitia bifera (Nyl.) Hafellner

Nova Hedwigia 35: 666 (1983)

Lecidea bifera Nyl., Ann. Sci. Nat., Bot.,sér. 4, 15: 47 (1861); Ann. Sci. Nat., Bot.,sér. 4, 19: 354 (1863); Lopadium biferum (Nyl.) Zahlbr., Cat. Lich. Univ. 4: 300 (1926).

T: New Caledonia, 1862, J.A.I.Pancher; lecto: H-NYL 18076, fide J.Hafellner, loc. cit.; isolecto: H-NYL 18075 n.v., M.

  Thallus olive-greenish to pale orange, thin, smooth, glossy; soredia and isidia absent. Apothecia common, scattered over the thallus, sessile, constricted at the base, 0.5–1.3 mm wide; disc red-brown, concave to ±plane; margin prominent, elevated above the disc, smooth, orange; disc and margin K+ purple; proper exciple of radiating hyaline agglutinated hyphae, the outer layer encrusted with anthraquinone crystals, colourless internally near the base of the apothecium. Epihymenium encrusted with anthraquinone crystals, rarely the crystals eroded. Hymenium inspersed with minute oil droplets, colourless, 80–100 μm thick; hypothecium yellow to pale brown. Asci usually 2-spored, rarely 3- or 4-spored, 60–75 × 16–24 μm. Ascospores broadly ellipsoidal, spirally septate and submuriform, with 8–11 primary lens-shaped locules, each with 1–4 vertical septa, 32–49 × 14–21 μm. Conidia not seen.
CHEMISTRY: Thallus and apothecia K+ purple; thallus containing ±fragilin (minor), fragilin bisanthrone (minor), exuviatic acid B (major); apothecia containing fragilin (minor), parietin (minor), fragilin bisanthrone (minor), physcoin bisanthrone (minor), exuviatic acid B (minor), ±emodin (trace), ±7-chloroemodinal (trace), ±7-chloroparietinic acid (trace).
  Common in eastern Qld where it grows on bark (rarely on rock) in subtropical and tropical forest. Also known from Lord Howe Island, Norfolk Island, Japan, New Caledonia, Tonga and Tahiti.  
  Elix (2009k)  

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

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