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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
Dirinaria flava (Müll.Arg.) C.W.Dodge

Beih. Nova Hedwigia 38: 181 (1971)

Physcia flava Müll.Arg., Hedwigia 31: 277 (1892).

T: NW of Red Hill, Ascension Island, 900 m, on rocks, July 1889, H.J.Gordon 90; lecto: BM, fide D.D.Awasthi, Biblioth. Lichenol. 2: 87 (1975); isolecto: G n.v.

  Thallus 2–6 cm wide, adnate to tightly adnate, pinnately to subdichotomously lobate. Lobes radiating, contiguous, becoming verrucose to subcrustose in the centre, plane to convex, 0.5–1.5 mm wide; apices discrete. Upper surface yellow to pale yellow-brown, tinged grey or blue-grey at the apices, delicately pruinose, sorediate; dactyls absent. Soralia laminal, globose to capitate, 0.2–0.3 mm wide, rarely erose and crateriform; soredia granular to, rarely, farinose. Medulla pale yellow to yellow. Lower surface brown-black. Apothecia very rare, sessile, 0.4–0.7 mm wide; disc dark brown to brown-black, epruinose. Epihymenium pale brown, c. 8 μm thick. Hymenium colourless, 65–75 μm thick. Hypothecium dark brown, 90–125 μm thick, lentiform. Ascospores 10–15 × 4–7 μm. Pycnidia not seen.
CHEMISTRY: Cortex K+ yellow, C+ orange-red, KC+ red, P–; medulla K–, C–, KC–, P–; containing atranorin (minor), chloroatranorin (minor), divaricatic acid (major), arthothelin (major), 4,5-dichloronorlichexanthone (minor), 3β-acetoxyhopane-1β,22-diol (minor),±unknown terpenes (minor).
  Occurs on bark and rocks in coastal and montane forests in Qld and eastern N.S.W. Also in Africa and on Ascension Island (South Atlantic Ocean).  
  Elix (2009l)  

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

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