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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
Melanotrema columellatum (Nyl.) Mangold

in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 655 (2009)

Thelotrema columellatum Nyl., Bull. Soc. Linn. Normandie, sér. 2, 2: 76 (1868); — Phaeotrema columellatum (Nyl.) Zahlbr., Cat. Lich. Univ. 2: 606 (1923).

T: Lifou, Loyalty Islands, New Caledonia, C.Thiébaut s.n.; lecto: H-NYL 22569, fide A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 655 (2009).

Phaeotrema picteanum Müll.Arg., Nuovo Giorn. Bot. Ital. 23: 276 (1891); Thelotrema picteanum (Müll.Arg.) Vain., Ann. Acad. Sci. Fenn., ser. A, 15(6): 186 (1921). T: Singapore, Pictet s.n.; iso: NSW, NY.

Ocellularia meiospermoides Hale, Bull. Brit. Mus. (Nat. Hist.) Bot. 8: 313 (1981); Melanotrema meisospermoides (Hale) Frisch, in A.Frisch, K.Kalb & M.Grube, Biblioth. Lichenol. 92: 393 (2006). T: Southern Province, Sri Lanka, M.E.Hale 46268; holo: US.

  Thallus endophloeodal to epiphloeodal, to c. 300 µm thick, pale grey to pale greenish or yellowish grey, dull, smooth to usually rough and porous, continuous to ±verruculose, predominantly non-rimose. Protocortex present or absent, discontinuous, to c. 20 µm thick. Algal layer variously developed, ±discontinuous; calcium oxalate crystals ±abundant, small to large, scattered or clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 1.2 mm diam., ±rounded, apothecioid, solitary or fused, immersed but usually ±distinctly emergent and hemispherical to cylindrical. Disc with the columella visible, ±distinctly pruinose, whitish to darkish greyish, free or partly fused with the thalline rim, entire to ±complex, especially in fused ascomata. Pores to c. 0.6 mm diam., rounded to slightly irregular, entire; apex of proper exciple becoming visible from above, free, ±pruinose, greyish, rather short, slightly incurved to erect. Thalline rim margin broad to gaping, ±rounded to ±irregular, thin to moderately thick, entire to coarsely split or eroded, concolorous with the thallus, rarely brownish; thalline rim incurved to erect. Proper exciple free, moderately thin to thick towards the upper parts, brownish internally and at the base to distinctly carbonised marginally and in the upper parts, apically sometimes covered by greyish granules, sometimes amyloid at the base. Hymenium to c. 120 µm thick, not inspersed, moderately conglutinated; paraphyses ±bent, ±interwoven, unbranched, with ±thickened tips; columellar structures to 600 µm wide, replacing most of the hymenium, entire to complex, particularly in fused ascomata, entirely carbonised, covered by a ±thick layer of greyish granules. Epihymenium hyaline, with greyish or brownish granules. Ascus tholus absent to thick when mature. Ascospores transversely septate to indistinctly submuriform, usually oblong, rarely ellipsoidal or fusiform, with roundish to subacute ends, becoming brown when immature, amyloid, 12–25 × 5–10 µm, with 4–8 (–9) × 1–3 locules; locules ±rounded to slightly angular, oblong to ±lentiform, subglobose or irregular in submuriform areas; end cells the same shape or hemispherical; septa thick, regular to slightly irregular; ascospore wall moderately thin to thick, non-halonate; endospore moderately thin to thick. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Corticolous in rainforest in north-eastern Qld, at altitudes to 1000 m; also in Sri Lanka, SE Asia and New Caledonia.  
  Mangold et al. (2009)  

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

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