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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
Maronea constans (Nyl.) Hepp
  Flechten Eur. [771] (1860); Lecanora constans Nyl., Mém. Soc. Sci. Nat. Cherbourg 3: 199 (1855). T: Fontainebleau, France; lecto: H-NYL 25967, n.v., fide K.P.Singh, Geophytology 10: 34 (1980).  
  Thallus pale greyish, pale olive-green to dingy olive-brown, very thin and effuse to areolate and rather lumpy, 70–300 µm thick, not sorediate, with the areoles dispersed or contiguous, sometimes over a very thin brownish prothallus; photobiont cells ±globose, 10–16 µm wide; medulla hyaline, I–. Apothecia 0.3–1.0 mm wide, scattered; thalline margin thin, smooth or minutely crenulate, entire and persistent or, rarely, partially interrupted or developed mainly on the underside of the apothecia and then revealing a very thin pale proper margin; disc orange-brown to black-brown, typically epruinose, but rarely with a partial and very light greyish pruina, plane to undulate, never becoming markedly convex. Thalline excipulum in section 60–140 µm thick; proper excipulum not apparent or to 10–15 µm thick. Hypothecium 100–120 µm thick. Hymenium 60–100 µm thick, I+ deep blue, but with the amyloid reaction restricted to the ascus walls. Asci 55–90 × 15–20 µm. Paraphyses rather stout, 2–3 µm, with apices not markedly swollen, pale brown. Ascospores oblong or slightly medially constricted, simple or rarely with a central plasma bridge, (4–) 5–7 (–8) × (2.0–) 2.5–3.5 µm. Pycnidia not seen. CHEMISTRY: Thallus K–, KC–, C–, Pd–, UV–; containing sekikaic acid with traces of homosekikaic and 4’-O-demethylsekikaic acids.
  Widespread in south-eastern Australia (S.A., N.S.W., Vic. and Tas.), occurring on the smooth bark of trees and shrubs, mainly in sclerophyllous forests and scrub, especially in locally moister pockets of such vegetation on hilltops or in gullies, as well as in gully remnant patches of cool-temperate rainforest where it is restricted to canopy twigs. Very widespread globally and also known from Europe, North and South Africa, New Zealand and Japan.  
  Kantvilas (2004e)  

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

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