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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 albo-olivaceum Vain.

Mycologia 21: 38 (1929)

Ocellularia albo-olivacea (Vain.) Zahlbr., Cat. Lich. Univ. 8: 244 (1932).

T: Vega Baja, Porto Rico [Puerto Rico], B.Fink 2153; holo: TUR-V 34714; iso: NY.

  Thallus endophloeodal to epiphloeodal, to c. 100 µm thick near ascomata, olive to brownish olive or pale yellowish brown, ±glossy, smooth, continuous to slightly verruculose, non-rimose. True cortex ±continuous, consisting of periclinal to irregular hyphae, occasionally with crystal inclusions, to c. 35 µm thick. Algal layer poorly developed and discontinuous; calcium oxalate crystals abundant, small to large, often clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 0.7 mm diam., ±rounded, apothecioid, solitary to marginally fused, erumpent, usually distinctly emergent, cylindrical to conical, with a depressed apex. Disc sometimes becoming partly visible from above, pale greyish, distinctly pruinose. Pores to c. 0.4 mm diam., ±rounded to slightly irregular, entire to slightly split. Proper exciple usually completely visible from above, free, apically whitish, pale brownish towards the base, incurved, often shrunken. Thalline rim margin entire to more often split to lacerate or eroded, occasionally ±coarsely lobed, not layered, ±rounded, off-white, often slightly pruinose; thalline rim concolorous with the thallus, often slightly verruculose, initially erect, becoming slightly recurved. Proper exciple free, thin, hyaline internally to yellowish brown marginally, apically covered with greyish granules, non-amyloid. Hymenium to c. 100 µm thick, not inspersed, moderately conglutinated; paraphyses slightly interwoven, unbranched, the tips thickened; lateral paraphyses usually conspicuous, to c. 25 µm long; columellar structures absent. Epihymenium hyaline, with greyish granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores usually transversely septate, occasionally with a single longitudinal septum, fusiform to clavate, with narrowly rounded to subacute ends, hyaline, distinctly amyloid, 15–23 × 5–7 µm, with 4–6 × 1 (–2) locules; locules ±rounded, rarely angular, subglobose to lentiform or ±rounded-rectangular to ±irregular; end cells hemispherical to ±distinctly conical; septa thick, ±regular; ascospore wall thick, occasionally slightly crenate, initially halonate, non-halonate at maturity. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing constictic acid (major), stictic acid (major), a-acetylconstictic acid (trace), cryptostictic acid (trace).
  Known from bark at one rainforest locality in north-eastern Qld (700 m altitude); pantropical.  
  Mangold et al. (2009)  

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

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