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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
Ocellularia andamanica (Nyl.) Tat.Matsumoto & Deguchi

Bryologist 102: 89 (1999)

Thelotrema andamanicum Nyl., Bull. Soc. Linn. Normandie, sér. 2, 7: 167 (1873); — Leptotrema andamanicum (Nyl.) A.L.Sm., J. Linn. Soc. London, Bot. 46: 74 (1922); — Myriotrema andamanicum (Nyl.) Hale, Mycotaxon 11: 132 (1980).

T: Andaman Islands, 1867, S.Kurz s.n.; lecto: H-NYL 22, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 275 (1981).

  Thallus endophloeodal to epiphloeodal, to c. 250 µm thick, pale grey to pale yellowish or greenish grey, dull to slightly glossy, smooth, continuous to markedly verruculose, non-rimose. Protocortex continuous or discontinuous, to 20 µm thick. Algal layer well developed, continuous; calcium oxalate crystals small to moderately large, scattered or clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.7 mm diam., ±rounded, ±perithecioid, solitary to marginally fused, immersed to slightly emergent, then hemispherical. Disc not visible from the above; pore occasionally filled by the whitish-pruinose columella tip. Proper exciple not visible from above; thalline rim margin to 0.2 mm diam., ±rounded, entire, thick, often depressed or funnel-shaped, concolorous with the thallus to brownish; thalline rim incurved. Proper exciple fused to detached (in endophloeodal parts), moderately thin to thick, yellowish brown internally, dark brown to distinctly carbonised marginally, non-amyloid. Hymenium to c. 220 µm thick, not inspersed, strongly conglutinated; paraphyses ±bent, curly towards the moderately thickened tips, ±interwoven, unbranched; columellar structures present in older ascomata, rather poorly developed, to c. 100 µm wide, entire, occasionally with a distinctly tapered tip and/or overlaying the hymenium, ±strongly carbonised, usually covered with greyish granules. Epihymenium hyaline, lacking granules. Asci 4–8-spored; tholus absent; lateral walls initially thick, becoming thin. Ascospores submuriform, subglobose to ovoid, rarely ellipsoidal or slightly oblong, with ±rounded ends, brown at maturity, strongly amyloid before initial pigmentation, 15–20 × 12–15 µm, with 2–4 (–6) × 1–4 locules; locules ±rounded, rarely angular, subglobose to oblong or irregular, only in immature stages with 1 or 2 more distinct ±regular thin central septa, otherwise with irregular and indistinct septation; ascospore wall thick, thinly halonate; endospore thin. Pycnidia immersed, with a darkened pore area. Conidia bacilliform, to c. 5 × 1 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (minor to trace).
  Rare on bark in lowland rainforest in north-eastern Qld. A Palaeotropical species.  
  Mangold et al. (2009)  

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

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