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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 bicavatum Nyl.

Flora 47: 269 (1864)

Ocellularia bicavata (Nyl.) Müll.Arg., Bull. Herb. Boissier 2, App. 1: 74 (1894).

T: Nova Hollandia [Australia], comm. Hochstetter s.n.; holo: H-NYL 22790; iso: M.

  Thallus endophloeodal to epiphloeodal, to c. 250 µm thick, pale greyish green to pale yellowish grey, dull, smooth, continuous to rarely verrucose, sparingly to distinctly rimose. Protocortex discontinuous, to 20 µm thick. Algal layer poorly developed, discontinuous; calcium oxalate crystals sparse and small, scattered or in large clusters. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.6 mm diam., ±rounded to somewhat irregular, apothecioid, solitary, rarely marginally fused, immersed to emergent, then hemispherical to conical, rarely verrucose-urceolate. Disc partly visible from above in mature ascomata, greyish, pruinose. Pores c. 0.3 (–0.5) mm diam., ±rounded to irregular, entire to slightly split; apex and upper parts of the proper exciple visible from above, free, off-white to pale yellowish, pale brownish towards the base, predominantly incurved to rarely somewhat erect, often ±distinctly shrunken. Thalline rim margin thin to thick, ±rounded to slightly irregular, entire to slightly split, concolorous with the thallus; thalline rim incurved to slightly erect, concolorous with the thallus, rarely pale brownish. Proper exciple free, thick, hyaline to pale yellowish internally, greyish brown to yellowish grey marginally, apically occasionally dark brownish, often incorporating substratum particles, ±distinctly amyloid at the base. Hymenium to c. 150 µm thick, not inspersed, moderately conglutinated; paraphyses ±straight, parallel to slightly interwoven, unbranched, the tips moderately thickened; lateral paraphyses inconspicuous, to c. 15 µm long; columellar structures absent. Epihymenium hyaline, with greyish or brownish granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, oblong to predominantly fusiform or clavate, with rounded to subacute ends, hyaline, faintly to moderately amyloid, 20–40 (–45) × 6–9 µm, with 8–14 (–16) locules; locules ±rounded to slightly angular, oblong to lentiform, with hemispherical to conical end cells; septa thick, ±regular; ascospore wall thick, initially thinly halonate; endospore thick. Pycnidia not seen.
CHEMISTRY: Thallus K+ orange-red, C–, P–; containing norstictic acid (major), connorstictic acid (minor to trace).
  Corticolous in a range of rainforest types in Qld, N.S.W. and Tas.; occurs from sea level to 800 m. Also in Japan and New Zealand.  
  Mangold et al. (2009)  

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

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