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Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Leucodecton glaucescens (Nyl.) Frisch

in A.Frisch, K.Kalb & M.Grube, Biblioth. Lichenol. 92: 164 (2006)

Thelotrema glaucescens Nyl., Ann. Sci. Nat., Bot., sér. 4, 19: 332 (1863); — Leptotrema glaucescens (Nyl.) Müll.Arg., Flora 65: 499 (1882); — Myriotrema glaucescens (Nyl.) Hale, Mycotaxon 11: 133 (1980).

T: Louisiana, U.S.A., J.Hale s.n.; lecto: FH-TUCK, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 282 (1981); isolecto: H-NYL.

  Thallus epiphloeodal, to c. 1 mm thick, bulging and partly flaking away from the substratum, greyish to greyish green or pale yellowish, usually dull, rarely slightly glossy, smooth, often with a speckled surface pattern, continuous to verruculose, rimose or not. Protocortex ±continuous, to c. 25 µm thick. Algal layer usually continuous and well developed, occasionally becoming discontinuous due to crystal inclusions; calcium oxalate crystals abundant, small to large, scattered or clustered, sometimes forming columns. Medulla well developed. Vegetative propagules not seen. Ascomata abundant, conspicuous, to c. 0.4 mm diam., ±rounded, but usually ±irregular or angular, apothecioid, solitary or fused and clustered, often forming stroma-like structures, immersed. Disc usually completely visible from above, greyish-pruinose. Pores broad, to c. 0.35 mm diam., formed by the proper exciple; apex of proper exciple becoming visible from above, ±rounded to ±irregular or angular, usually entire, free, short, off-white, often ±shrunken, erect to slightly recurved. Thalline rim margin gaping, thin to thick, ±rounded to ±irregular or angular, entire or slightly eroded, brighter than or concolorous with the thallus. Proper exciple becoming partly to entirely free, thin, hyaline to pale yellowish internally, orange to pale brownish marginally, non-amyloid, often with old ascospores in the space between hymenium and proper exciple. Hymenium to c. 120 µm thick, moderately conglutinated; paraphyses straight to slightly bent, interwoven, sparingly branched towards the margins and the apical hymenium, with distinctly thickened tips; fused ascomata sometimes with columella-like structures. Epihymenium hyaline, with greyish to pale brown granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores submuriform, subglobose to oblong or ellipsoidal, with ±rounded to narrowly rounded ends, brown, non-amyloid, rarely very faintly amyloid, 7–17 × 5–9 µm, with 4–6 × 1–3 locules; locules ±rounded, subglobose to oblong; transverse septa thin, regular; ascospore wall thick, non-halonate; endospore thick. Pycnidia immersed; pore darkened. Conidia ±rounded, oval or fusiform, to c. 3 × 1 µm.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing constictic acid (major), stictic acid (major), hypostictic acid (major), a-acetylconstictic acid (trace), hypoconstictic acid (trace), cryptostictic acid (trace).
  Corticolous in subtropical and tropical rainforest in eastern Qld, at altitudes to 900 m. Pantropical and subtropical.  
  Mangold et al. (2009)  

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

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