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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 conveniens Nyl.

Bull. Soc. Linn. Normandie, sér. 2, 7: 168 (1873)

T: Tequendama, Nova Granata [Colombia], 1863, A.Lindig s.n.; lecto: H-NYL 22496, fide M.E.Hale, Smithsonian Contr. Bot. 38: 42 (1978).

  Thallus immersed to superficial, to c. 300 µm thick, grey to pale yellowish brown or pale greyish green, dull to slightly glossy, smooth to rough, continuous to slightly verrucose, ±rimose to areolate. Protocortex continuous or discontinuous, to 25 µm thick, rarely becoming weakly conglutinated and forming a true cortex of periclinal to irregular hyphae. Algal layer largely discontinuous; calcium oxalate crystals usually abundant, small to large, scattered or clustered. Vegetative propagules not seen. Ascomata to 0.6 mm diam., ±rounded, perithecioid to predominantly apothecioid, solitary to marginally slightly fused, immersed to ±distinctly emergent, verrucose-hemispherical, rarely urceolate. Disc occasionally becoming partly visible from above, pale greyish to grey, distinctly pruinose. Pores small to wide, to c. 0.3 mm diam., ±rounded to irregular; apex of the proper exciple visible from above, free only in upper parts, rarely completely free, off-white, ±shrunken, largely incurved, rarely somewhat erect. Thalline rim margin ±rounded to irregular, small to gaping, entire to ±distinctly split, rarely somewhat eroded, thin to thick, incurved, rarely slightly erect, concolorous with the thallus, occasionally brighter or brownish. Proper exciple free, but usually only in the upper parts, thin to thick, hyaline to pale yellowish internally, yellowish brown to brownish marginally, apically occasionally dark brown or dark grey, very rarely slightly amyloid at the base and in parts of subhymenium. Hymenium to c. 250 µm thick, not inspersed, moderately conglutinated; paraphyses parallel or slightly interwoven, unbranched, the tips thickened; lateral paraphyses conspicuous or not, to c. 30 µm long; columellar structures absent. Epihymenium hyaline, usually with fine or coarse greyish to dark grey granules. Asci 1-spored; tholus initially thick, thin when mature. Ascospores muriform, cylindrical to oblong-ellipsoidal or broadly fusiform, rarely bifusiform, with ±rounded to narrowly rounded ends, hyaline, becoming yellowish to brownish, distinctly brown only at late stages of maturity or in decayed ascospores, strongly amyloid at maturity, 80–200 × 20–40 µm, with numerous locules; locules mostly ±rounded to slightly angular, subglobose to ±irregular; transverse septa thin, distinct and regular throughout development; ascospore wall and endospore thin at maturity; wall non-halonate. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Occurs on bark and rock in tropical, subtropical and warm-temperate rainforest in eastern Qld and N.S.W., at altitudes of 100–800 m; also known from the Neotropics.  
  Mangold et al. (2009)  

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

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