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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
Dibaeis arcuata (Stirt.) Kalb & Gierl
  in C.Gierl & K.Kalb, Herzogia 9: 617 (1993); Baeomyces arcuatus Stirt., J. Linn. Soc., Bot. 14: 460 (1875). T: near Wellington, New Zealand, J.Buchanan 28/74; lecto: BM n.v., fide D.J.Galloway, Bot. Notiser 133: 79 (1980).  
  Primary thallus variable, thin and smooth to thick and minutely warty, to 0.3 (–0.5) mm thick above substratum, ±glossy to dull and scurfy, rimose to areolate with white hyphae visible between areoles, white to pale ash grey to very pale green to buff to pale ochre or soil-coloured (due to soil leachates) to green-grey, rarely lead-grey in deep shade, spuriously maculate if thallus between warts is discoloured by leachates, in deep shade almost as a thin hyphal 'wash' over the photobiont, ±densely pruinose. Soredia initially in small round soralia, coalescing into larger irregular patches to 11 × 9 mm, farinose to granular, chalky white (especially in Tasmanian material) to pale grey-green or discoloured by lichenicolous fungi. Apothecia stipitate, solitary to clustered, solitary on each stipe or very rarely bifurcate with 2 discs; stipe to 6–12 (–14) mm tall and 0.5–1.5 mm wide, round in cross-section when young, often irregularly laterally compressed with age, rarely fissured or splitting, sometimes fusing with adjoining stipe, variably lichenised, often strongly sorediate in basal half and densely pruinose adjacent to disc to wholly white-pruinose and scurfy; older stipes often eroding to expose white to rose-pink internal tissue; disc to 5 mm diam., pale to bright rose-pink to pinkish orange to flesh-pink, always darker than stipe, often densely pruinose, smooth to scabrid to lightly fissured or warted, plane when young and narrower than stipe diameter, soon convex and ±club-shaped or hemispherical to distorted-hemispherical with 'sunken' patches, always immarginate, sometimes fusing with disc of adjacent apothecium. Ascospores fusiform, simple or rarely 1-septate, straight or rarely weakly curved, (14–) 17–23 (–26.5) × (2–) 2.5–3 (–4) µm (Australian specimens). Pycnidia not seen. CHEMISTRY: Primary thallus and soralia K– or K+ pale yellow, UV+ white; apothecia (disc and stipe) K+ yellow, P+ yellow-orange; containing baeomycesic acid (major), squamatic acid (±trace), consquamatic acid (±trace), barbatic acid (±faint trace) and ursolic acid (±trace).
  Occurs in south-eastern Qld, N.S.W., A.C.T., Vic. and Tas; abundant in Tas., but rare and restricted to cooler habitats at higher altitudes in north-eastern N.S.W. and south-eastern Qld. Also occurs throughout New Zealand.  
  Johnston (2001b)  

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

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