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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 denegans (Nyl.) Elix & Hale
  Mycotaxon 29: 240 (1987)
Parmelia denegans Nyl., Acta Soc. Sci. Fenn. 26: 6 (1900); Parmelina denegans (Nyl.) Hale, Phytologia 28: 482 (1974). T: Rampodde, Sri Lanka, E.Almquist; lecto: H-NYL, isolecto: S, fide M.E.Hale, Smithsonian Contr. Bot. 33: 25 (1976).
  Thallus adnate, to 5–9 cm wide. Lobes imbricate, sublinear, irregularly branched, 1–3 mm wide; marginal cilia irregularly dispersed, 0.4–0.7 mm long. Upper surface light greenish grey, shiny, obscurely maculate, smooth but soon developing small pustulate areas, without isidia; pustules eventually breaking open apically and forming coarse soredia. Medulla salmon-orange. Lower surface densely rhizinate; rhizines simple to sparsely branched, black. Apothecia rare, sessile, 2–3 mm wide. Ascospores 7–9 × 5–7 µm. Pycnidia rare. Conidia bacilliform, 5–6 × 1 µm. CHEMISTRY: cortex K+ yellow; medulla more intensely yellow-orange with K, C, and P tests, partly K+ purple; containing atranorin, chloroatranorin, zeorin, leucotylin and associated terpenes, secalonic acid A, and unidentified anthraquinones.
  Very rare in south-east Qld; also occurs in India, Sri Lanka and Sabah. Grows on bark and rock.  
  Elix (1994l)  

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

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