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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 saxicola (Vain.) G.Salisb.

Lichenologist 5: 269 (1972)

Thelotrema lepadinum subsp. saxicola Vain., Étud. Class. Lich. Brésil 3: 77 (1890); — Leptotrema saxicola (Vain.) Redinger, Ark. Bot. 28A(8): 102 (1936).

T: Minas Gerais, Brazil, E.A.Vainio s.n. (Lich. Bras. Exs. 1173); holo: TUR-V 26784.

  Thallus endophloeodal to epiphloeodal, to c. 400 µm thick, greyish green to pale yellowish, dull to slightly glossy, smooth, verrucose or verruculose, rarely continuous, rimose to somewhat areolate. Protocortex continuous or discontinuous, occasionally becoming conglutinated and forming a true cortex of periclinal hyphae to c. 20 µm thick. Algal layer well developed, ±continuous; calcium oxalate crystals sparse to numerous, small to large, usually scattered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.6 mm diam., ±rounded, solitary to marginally fused, sessile, perithecioid, immersed to emergent, then mostly hemispherical or somewhat cylindrical. Disc not visible from above. Pores minute, to c. 0.05 (–0.1) mm diam., ±rounded to slightly irregular, entire to slightly split, the proper exciple margin occasionally visible from above, fused, rarely slightly detached, whitish-translucent or pale to dark grey, level with the thalline rim margin or somewhat sunken. Thalline rim margin thick, ±rounded, usually entire, concolorous with the thallus or paler; thalline rim incurved. Proper exciple fused, thin, hyaline internally, pale yellowish to yellowish brown marginally, apically often dark brown to slightly carbonised, in corticolous specimens often with an indistinct marginal layer of substratum material, I+ reddish to purple at the base. Hymenium to c. 350 µm thick, inspersed, distinctly conglutinated; paraphyses thin, ±interwoven, unbranched, straight to somewhat bent, the tips unthickened; lateral paraphyses conspicuous, to 40 µm long; columellar structures absent. Epihymenium hyaline, without granules and crystals. Asci 1-spored; tholus initially thin, not visible at maturity. Ascospores muriform, oblong, rarely fusiform, with ±rounded to narrowly rounded ends, hyaline, becoming yellowish to brownish at late maturity, non-amyloid to usually weakly amyloid in older stages, 150–250 × 30–50 µm, with numerous locules; locules small, ±rounded to slightly angular, subglobose or irregular; transverse septa thin, becoming indistinct with age, ±regular; ascospore wall thin to slightly thickened, non-halonate; endospore absent. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (trace), subpsoromic acid (trace).
  Corticolous in rainforest in north-eastern Qld and north-eastern N.S.W.; also in Brazil, where it has been found on bark and on siliceous rocks.  
  Mangold et al. (2009)  

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

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