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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 subcompunctum (Nyl.) Frisch

in A.Frisch, K.Kalb & M.Grube, Biblioth. Lichenol. 92: 162 (2006)

Thelotrema subcompunctum Nyl., Bull. Soc. Linn. Normandie, sér. 2, 2: 76 (1868); — Leptotrema subcompunctum (Nyl.) Zahlbr., Cat. Lich. Univ. 2: 640 (1923); — Myriotrema subcompunctum (Nyl.) Hale, Mycotaxon 11: 135 (1980).

T: Lifou, Loyalty Islands, New Caledonia, 1864, C.Thiébaut s.n.; lecto: H-NYL 22440, fide M.E.Hale, Smithsonian Contr. Bot. 16: 42 (1974); isolecto: G, PC.

Leptotrema diffractum Müll.Arg., Hedwigia 30: 50 (1891). T: Bellenden Ker, Qld, F.M.Bailey 527; holo: G; iso: BRI.

Leptotrema polycarpum Müll.Arg., Bull. Herb. Boissier 3: 315 (1895). T: Qld, 1887, C.Knight 80; lecto: G, fide A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 655 (2009); isolecto: G.

Leptotrema inclusum Zahlbr., Bot. Mag. (Tokyo) 41: 317 (1927). T: Kinkuwasan, Japan, June 1902, U.Faurie 5147; holo: W.

Myriotrema decorticatum Hale, Bull. Brit. Mus. (Nat. Hist.) Bot. 8: 277 (1981). T: Matara District, Sri Lanka, M.E.Hale 46259; holo: US.

  Thallus endophloeodal to epiphloeodal, to c. 400 µm thick, pale greyish to yellowish green or pale olive, dull to somewhat glossy, smooth to rough or porous, continuous to verrucose or verruculose, non-rimose to markedly rimose or areolate. Cortical structures occasionally lacking in immature specimens, otherwise the thallus with a ±continuous protocortex to c. 30 µm thick, this sometimes becoming conglutinated and forming a true cortex of mostly irregular hyphae. Algal layer well developed, continuous; calcium oxalate crystals small to large, scattered or clustered, often forming a continuous layer in the lower medulla. Vegetative propagules not seen. Ascomata inconspicuous to moderately conspicuous, to c. 0.4 mm diam., mostly ±rounded to slightly irregular, becoming apothecioid, solitary to marginally fused, occasionally clustered, predominantly immersed to slightly raised or rarely distinctly emergent and hemispherical to slightly subglobose and with same surface features as the thallus. Disc often becoming partly visible from above, greyish, slightly to strongly greyish-pruinose. Pores small to moderately broad, to c. 0.3 mm diam., mostly formed by the proper exciple; proper exciple apically or the upper parts usually becoming visible from above, largely free at maturity, short, whitish to greyish or brownish, sometimes shrunken, incurved to erect, rarely somewhat recurved. Thalline rim margin broad to gaping, thin to thick, ±rounded to slightly elongate or irregular, entire, incurved; thalline rim concolorous with the thallus or somewhat brighter. Proper exciple usually becoming free apically or in the upper parts, thin to thick, hyaline to pale yellowish or pale brownish internally, yellowish to greyish brown or brownish marginally, occasionally slightly carbonised or dark brown apically, non-amyloid to faintly amyloid at the base. Hymenium to c. 150 µm thick, strongly conglutinated; paraphyses ±bent to often distinctly curled in apical parts, interwoven, unbranched to sparingly branched towards the margins, with slightly thickened tips. Epihymenium hyaline, with greyish brown granules and small crystals. Asci 8-spored; tholus thin, not visible at maturity. Ascospores submuriform to muriform, oblong to ellipsoidal or fusiform, with rounded to subacute ends, becoming brown (usually at late maturity), non-amyloid to faintly amyloid when immature, 10–45 (–50) × 7–20 µm, with (4–) 6–10 (–12) × 1–6 locules; locules ±rounded to slightly angular, subglobular to oblong or somewhat irregular; transverse septa thin to thick, predominantly regular; ascospore wall thick, non-halonate; endospore thin to thick. Pycnidia not seen; according to Frisch et al. (2006) immersed with a blackish and sometimes detached pore area; conidia irregular, narrow elliptical to obovate, to 5 × 1.2 µm.
CHEMISTRY: Thallus K+ yellow, C–, P+ orange; containing constictic (major), stictic acid (major), cryptostictic acid (minor to trace), hypoconstictic acid (minor to trace), hypostictic acid (minor to trace).
  On tree bark in eastern Qld and N.S.W.; grows in rainforest and wet-sclerophyll forest, at altitudes to 1500 m. Pantropical and subtropical, including Lord Howe Island.  
  Mangold et al. (2009)  

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

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