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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
Leucodecton albidulum (Nyl.) Mangold

in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 654 (2009)

Thelotrema albidulum Nyl., Ann. Sci. Nat., Bot., sér. 4, 15: 46 (1861); — Myriotrema albidulum (Nyl.) Hale, Mycotaxon 11: 132 (1980).

T: Balade, New Caledonia, 1867, E.Vieillard s.n.; holo: H-NYL 22767; iso: H-NYL 22770, PC.

  Thallus endophloeodal to epiphloeodal, to c. 500 µm thick, off-white to pale greyish green, dull, smooth to rough, pruinose, continuous to verrucose, ±distinctly rimose. Cortex and protocortex absent. Algal layer usually well developed, continuous or discontinuous; calcium oxalate crystals usually abundant, scattered or clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.6 mm diam., sometimes ±rounded, more commonly ±irregular, apothecioid, solitary or fused and clustered, occasionally forming stroma-like structures, mostly immersed. Disc usually completely visible from above, greyish-pruinose. Pores broad to gaping, to c. 0.55 mm diam., formed by the proper exciple; apex of proper visible from above, free, rarely ±rounded, more commonly ±irregular or angular, usually entire, very short, off-white, often ±shrunken, erect to slightly incurved. Thalline rim margin thin to thick, rounded to angular, gaping, entire to slightly eroded, concolorous with or brighter than the thallus. Proper exciple becoming completely free, pale yellowish internally to yellowish brown or brownish marginally, non-amyloid. Hymenium to c. 120 µm thick, moderately conglutinated; paraphyses straight or slightly bent, sparingly branched towards the margins; fused ascomata occasionally with columella-like structures. Epihymenium with greyish brown granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, mostly fusiform to clavate, sometimes slightly bent, with rounded to acute ends, brown, ±faintly amyloid, 25–45 × 5–7 µm, with 8–12 locules; locules initially angular, becoming ±rounded or subglobose to slightly lentiform; end cells hemispherical to, more often, conical; septa thin to thick, regular; ascospore wall non-halonate, thin to thick, becoming ±distinctly crenulate to irregular at late maturity; endospore becoming thick. Pycnidia immersed, with a darkened pore. Conidia bacilliform, to c. 6 × 1 µm.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing stictic acid (major), constictic acid (minor to major), hypostictic acid (minor to major), a-acetyl-constictic acid (trace), hypoconstictic acid (trace), cryptostictic acid (trace).
  Corticolous in rainforest in eastern Qld and north-eastern N.S.W. (200–900 m). Reported for the first time from Australia; also in New Caledonia.  
  Mangold et al. (2009)  

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

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