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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 oleosum Mangold

in H.T.Lumbsch, A.Mangold, M.P.Martín & J.A.Elix, Austral. Syst. Bot. 21: 225 (2008)

T: Sassafras Creek Track, Dorrigo Natl Park, N.S.W., 2005, A.Mangold 25m; holo: CANB; iso: NSW.

  Thallus endophloeodal to epiphloeodal, to c. 250 µm thick, greenish grey to olive, with a sharp reticulate pattern, dull to slightly glossy, smooth, verrucose to verruculose, ±rimose. True cortex continuous or discontinuous, to c. 30 µm thick, consisting of periclinal hyphae, or the thallus with a discontinuous protocortex, or ecorticate. Algal layer well developed, often discontinuous due to crystal inclusions; calcium oxalate crystals abundant, small to large, often clustered, rarely scattered. Vegetative propagules not seen. Ascomata inconspicuous, to 1.5 mm diam., ±rounded to irregular in fused ascomata, perithecioid, solitary to marginally fused, immersed to emergent, then hemispherical to somewhat subglobose. Disc not visible from above. Pores small, to c. 0.15 mm diam., ±rounded, rarely irregular, entire, upper parts of the proper exciple usually visible from above, fused to free, whitish to greyish, rarely slightly shrunken, incurved. Thalline rim margin ±rounded to rounded-irregular, small, entire, thin to thick, incurved, concolorous with the thallus to pale brownish. Proper exciple fused, becoming apically detached in older ascomata, thin, hyaline internally, pale yellowish and usually with substratum particles marginally, apically brown to dark brown, rarely slightly carbonised, non-amyloid. Hymenium to c. 400 µm thick, strongly inspersed and conglutinated; paraphyses ±bent and wavy, interwoven, unbranched, the tips not to slightly thickened; lateral paraphyses conspicuous, to c. 30 µm long, appearing coarse; columellar structures absent. Epihymenium hyaline, without granules. Asci 1-spored; tholus absent, often with somewhat thickened lateral ascus walls when immature. Ascospores muriform, oblong to fusiform, with ±rounded to narrowly rounded ends, becoming greyish to brownish at late maturity (old ascospores dark brown), ±distinctly amyloid, especially in hyaline stages, 120–250 × 30–50 µm, with numerous locules; locules small, ±rounded to somewhat angular, predominantly irregular; transverse septa thin, ±distinct, regular to slightly irregular; ascospore wall and endospore thin; wall often with a very thin indistinct halo. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no compounds detectable by TLC.
  An endemic, corticolous species in rainforest in eastern Qld and north-eastern N.S.W., at altitudes to 1130 m.  
  Mangold et al. (2009)  

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

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