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Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Thelotrema leucophthalmum Nyl.

Bull. Soc. Linn. Normandie, sér. 2, 2: 39 (1868)

T: Lifou, Loyalty Islands, New Caledonia, 1864, C.Thiébaut s.n.; lecto: H-NYL 22518, fide M.E.Hale (in herb., 1972).

Leptotrema albocoronatum C.Knight, in J.Shirley, Proc. Roy. Soc. Queensland 6: 192 (1889). T: Sankeys Scrub, [Brisbane], Qld, J.Shirley 509; lecto: WELT, fide A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 658 (2009); isolecto: BRI (AQ721248).

  Thallus endophloeodal to epiphloeodal, to c. 300 µm thick, pale yellowish green to yellowish brown to pale olive, waxy, smooth, continuous, non-rimose. True cortex yellowish, to c. 80 µm thick, consisting of irregular to periclinal hyphae. Algal layer continuous or discontinuous, well developed; calcium oxalate crystals abundant, variable in size, often clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 2 mm diam., ±rounded, slightly irregular in fused ascomata, apothecioid, erumpent, solitary to fused, moderately emergent, conical to broadly annular. Disc partly to rarely completely visible from above, pale greyish to pale flesh-coloured, coarsely pruinose. Pores becoming broad to gaping, to c. 1.5 mm diam., ±rounded to moderately irregular, the inner and apical proper exciple becoming visible from above, fused to free, ±jagged, whitish, incurved to recurved, somewhat shrunken only when completely free. Thalline rim margin usually thick, ±rounded to moderately irregular, split to lacerate, ±coarsely lobed, occasionally indistinctly layered, becoming ±distinctly eroded, whitish, pruinose; thalline rim concolorous with the thallus and having similar surface features, usually erect to recurved. Proper exciple thick, hyaline internally, pale yellowish grey to brownish marginally, often including calcium oxalate crystals, apically usually covered by greyish granules, non-amyloid, rarely faintly amyloid at the base. Hymenium to c. 130 µm thick, not inspersed, moderately conglutinated; paraphyses ±bent and interwoven, unbranched, the tips slightly thickened and somewhat irregular; lateral paraphyses usually inconspicuous, to c. 25 µm long; true columella absent, fused ascomata occasionally with columella-like structures. Epihymenium hyaline to pale greyish brown, with greyish granules and, occasionally, small crystals. Asci 6–8-spored; tholus initially thick, thin when mature. Ascospores muriform at maturity, oblong to ellipsoidal, rarely fusiform or clavate, with ±rounded to narrowly rounded ends, hyaline, non-amyloid, rarely faintly amyloid, 30–50 (–60) × 10–15 µm, with 8–16 × 1–5 (–6) locules: locules ±rounded to slightly angular, subglobose to oblong or irregular; transverse septa thin, distinct, regular; ascospore wall thick, occasionally with a thin irregular halo; endospore thick. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing stictic acid (major), constictic acid (major), hypostictic acid (major to trace), a-acetylconstictic acid (trace), cryptostictic acid (trace).
  Corticolous in rainforest and wet-sclerophyll forest in eastern Qld, at altitudes to 900 m. Also in the Andaman Islands and New Caledonia.  
  Mangold et al. (2009)  

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

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