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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 defossum (Müll.Arg.) Mangold

in H.T.Lumbsch, A.Mangold, M.P.Martín & J.A.Elix, Austral. Syst. Bot. 21: 221 (2008)

Ocellularia defossa Müll.Arg., Bot. Jahrb. 5: 138 (1884).

T: Mt Taimanani, Timor, 1883, Naumann 386 p.p.; holo: G.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale yellowish grey to pale olive, dull to slightly glossy, smooth, continuous to distinctly verrucose and rimose. Protocortex discontinuous, to 10 µm thick. Algal layer well developed, continuous or discontinuous due to crystal inclusions; calcium oxalate crystals sparse to abundant, small to large, scattered or clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.3 mm diam., usually ±rounded, occasionally slightly elongate, apothecioid, solitary or fused, mostly immersed, sometimes becoming somewhat raised in strongly verrucose thalli. Disc not visible or becoming partly visible from above, greyish, predominantly epruinose. Pores to c. 0.2 mm diam., usually ±rounded, occasionally slightly elongate or somewhat irregular, entire to slightly split, apex of the proper exciple visible from above, occasionally somewhat shrunken, off-white, pale brownish towards the base, predominantly incurved. Thalline rim margin thin to thick, broad, entire to slightly split, ±rounded to irregular or elongate, rarely slightly layered, largely incurved, rarely somewhat erect, concolorous with the thallus or slightly paler. Proper exciple becoming partly free above, thin, hyaline internally, pale to dark brown marginally, apically often dark brown to slightly carbonised, often amyloid at the base. Hymenium to c. 80 µm thick, not inspersed, conglutinated; paraphyses moderately interwoven, unbranched, the tips ±thickened; lateral paraphyses inconspicuous, to c. 15 µm long; columellar structures absent. Epihymenium hyaline, rarely with sparse greyish granules. Asci 4–8-spored; tholus initially thin to thick, thin when mature. Ascospores transversely septate, mostly clavate, occasionally oblong to fusiform, with ±rounded to subacute ends, hyaline, initially non-amyloid, becoming weakly amyloid, 10–30 (–40) × 5–8 µm, with 4–11 (–12) locules; locules ±rounded to ±angular, lentiform to depressed-cuboidal; end cells hemispherical to conical; septa becoming thick, regular; ascospore wall mostly thin, with an often thick smooth to irregular halo. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Corticolous in rainforest in eastern Qld and N.S.W., at altitudes to 950 m; also in Timor and Lord Howe Island.  
  Mangold et al. (2009)  

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

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