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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
Myelochroa aurulenta (Tuck.) Elix & Hale
  Mycotaxon 29: 240 (1987)
Parmelia aurulenta Tuck., Amer. J. Sci. Arts, ser. 2, 25: 424 (1858); Parmelina aurulenta (Tuck.) Hale, Phytologia 28: 482 (1974); Hypotrachyna aurulenta (Tuck.) Krog & Swinscow, Lichenologist 19: 420 (1987). T: Harpers Ferry, Virginia, United States of America, E.Tuckerman; lecto: FH-TUCK, fide M.E.Hale, Smithsonian Contr. Bot. 33: 19 (1976).
  Thallus adnate, to 4–10 cm wide. Lobes sublinear to subirregular, 2–4 mm wide; apices subrotund; marginal cilia irregularly dispersed but mostly in lobe axils, to 0.8 mm long. Upper surface pale greenish grey, shiny, smooth to rugulose, lacking isidia, soon becoming sorediate to pustulate-sorediate; soralia to 1 mm wide, coalescing into large subcapitate clumps; soredia granular. Medulla white, becoming orange to sulphureous yellow beneath soralia and near exposed cracks in upper cortex. Lower surface with moderately dense to dense rhizines; rhizines simple or becoming sparsely furcate or squarrosely branched, black. Apothecia rare, sessile to subpedicellate, 2–5 mm wide; thalline exciple pustulate-sorediate. Ascospores 10–12 × 5–7 µm. Pycnidia rare. Conidia bifusiform, 5–6 × 1 µm. CHEMISTRY: cortex K+ yellow; medulla K-, C-, KC-, P-; containing atranorin, chloroatranorin, secalonic acid A, zeorin and leucotylic acid.
  Scattered in coastal and hinterland forests of eastern Australia (Qld and N.S.W.); also in Lord Howe Is. This pantemperate and pantropical species occurs on all continents except Europe. Grows on bark, rarely on rock.  
  Elix (1994l)  

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

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