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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
Thelotrema cupulare Müll.Arg.

Hedwigia 32: 131 (1893)

T: Brisbane, Qld, F.M.Bailey 375; holo: G; iso: BRI (AQ721240).

Thelotrema dissultum Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 254 (1981). T: Sabaragamuwa, Sri Lanka, M.E.Hale 51139; holo: US.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, yellowish brown to olive, waxy, smooth, continuous, non-rimose, occasionally appearing rimose due to the substratum. True cortex yellowish, to c. 100 µm thick, consisting of irregular to periclinal hyphae. Algal layer continuous or discontinuous, well developed; calcium oxalate crystals abundant, small to large, scattered or clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 1.8 mm diam., ±rounded, irregular in fused ascomata, erumpent, apothecioid or chroodiscoid, solitary to distinctly fused, immersed to emergent, then depressed-cylindrical to irregular. Disc partly to completely visible from above, pale greyish to pale flesh-coloured, coarsely pruinose. Pores broad to gaping, to c. 1 mm diam., ±rounded to moderately irregular, the inner part and apex of the proper exciple becoming visible from above, fused to free, ±jagged, whitish, incurved to recurved, somewhat shrunken when completely free. Thalline rim margin usually thick, ±rounded to moderately irregular, split to lacerate, ±coarsely lobed, occasionally indistinctly layered, becoming ±eroded with age, whitish, pruinose; thalline rim concolorous with the thallus, usually erect to recurved. Proper exciple thick, hyaline internally to pale yellowish grey or brownish marginally, often with calcium oxalate crystals, apically usually covered by greyish granules, non-amyloid to faintly amyloid at the base. Hymenium to c. 100 µm thick, not inspersed, moderately conglutinated; paraphyses ±bent and interwoven, unbranched, the tips slightly thickened and somewhat irregular; lateral paraphyses inconspicuous, to c. 20 µm long; true columella absent, fused ascomata occasionally with columella-like structures. Epihymenium ±thick, hyaline to pale greyish brown, with greyish granules and, occasionally, small crystals. Asci 8-spored; tholus initially thick, thin when mature. Ascospores initially transversely septate, becoming submuriform to muriform, ellipsoidal to fusiform or clavate, with ±rounded to subacute ends, hyaline, non-amyloid, 15–25 (–30) × 5–8 (–12) µm, with 4–9 (–10) × 1–3 (–4) locules; locules ±rounded to slightly angular, subglobose to lentiform; transverse septa thick, regular; ascospore wall thin to thick, non-halonate; endospore thick. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing stictic acid (major), constictic acid (major to minor), a-acetylconstictic acid (trace).
  Uncommon on bark in rainforest in eastern Qld, from sea level to 500 m; also in Sri Lanka.  
  Mangold et al. (2009)  

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

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