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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
Thelotrema pseudosubtile Mangold

in H.T.Lumbsch, A.Mangold, M.P.Martín & J.A.Elix, Austral. Syst. Bot. 21: 225 (2008)

T: Crystal Cascades, 5 km W of Cairns, Qld, 2003, H.T.Lumbsch & A.Mangold 19117k; holo: CANB; iso: BRI.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale yellowish grey to pale olive, dull to slightly glossy, smooth, continuous to ±distinctly verrucose or verruculose, sparingly to strongly rimose. Protocortex discontinuous to continuous, to c. 20 µm thick, occasionally becoming conglutinated and forming a true cortex of periclinal hyphae, to 40 µm thick. Algal layer moderately well developed, continuous; calcium oxalate crystals sparse to abundant, usually small, often clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.3 (–0.6) mm diam., ±rounded, apothecioid, sessile, solitary to marginally or completely fused, mostly ±immersed to slightly emergent, depressed-hemispherical, having the same surface features as the thallus. Disc often becoming partly visible from above, greyish to pale flesh-coloured, epruinose to slightly pruinose. Pores small, to c. 0.15 (–0.25) mm diam., ±rounded to slightly irregular, predominantly entire to slightly split, the proper exciple apically to (very rarely) completely visible from above, occasionally somewhat shrunken, off-white, pale brownish towards the base, usually incurved. Thalline rim margin thin, becoming moderately wide, rarely gaping with age, ±rounded to irregularly rounded, usually entire, rarely slightly split, usually incurved to rarely somewhat erect, concolorous with the thallus or a little paler. Proper exciple becoming partly to completely free, mainly thin, hyaline to pale yellowish internally, brownish or greyish brown marginally, apically often dark brown, occasi occasionally onally with substratum inclusions, often amyloid at the base. Hymenium to c. 150 µm thick, not inspersed, distinctly conglutinated; paraphyses moderately interwoven, unbranched to sometimes sparingly branched, the tips thickened; lateral paraphyses usually inconspicuous, to c. 20 µm long; columellar structures absent. Epihymenium hyaline, occasionally brownish with age, with greyish granules and small crystals. Asci 2–8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, rarely with a single longitudinal septum, mostly clavate, occasionally oblong to fusiform, the ends ±rounded to acute, hyaline, faintly to strongly amyloid, 25–60 × 6–9 µm, with 7–16 locules; locules ±rounded to somewhat angular, rarely subglobose to lentiform or slightly irregular; end cells hemispherical to conical; septa thin to thick, regular or irregular; ascospore wall thick, often distinctly crenate, thinly halonate. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Corticolous in tropical and subtropical rainforest, warm-temperate forest and wet-sclerophyll forest, at altitudes to 950 m. Occurs in eastern Qld, eastern N.S.W. and 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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