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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
Chapsa alborosella (Nyl.) Frisch

in A.Frisch, K.Kalb & M.Grube, Biblioth. Lichenol. 92: 91 (2006)

Graphis alborosella Nyl., Ann. Sci. Nat., Bot., sér. 4, 19: 372 (1863); — Thelotrema alborosellum (Nyl.) Tuck., Gen. Lich. 139 (1872); — Ocellularia alborosella (Nyl.) R.Sant., Symb. Bot. Upsal. 12(1): 308 (1952); — Chroodiscus alborosellus (Nyl.) Kalb, Lich. Neotrop. 20: [8] (1991).

T: Nova Granata [Colombia], 2000 m, 1860, A.Lindig 2694; holo: H-NYL7635; iso: BM, FH-TUCK.

  Thallus usually endophloeodal, rarely epiphloeodal, to c. 50 µm thick, pale grey to greyish green or pale yellowish green, dull to slightly glossy, smooth to slightly pruinose, often with the substratum protruding, continuous, non-rimose. Cortex absent or the thallus with a thin discontinuous protocortex to 10 µm thick. Algal layer continuous and well developed; calcium oxalate crystals sparse and scattered. Vegetative propagules not seen. Ascomata conspicuous, to c. 1.2 mm diam., to irregular, apothecioid when immature,
becoming chroodiscoid and erumpent, solitary to marginally fused, often in groups of 2–several, sometimes regenerating, immersed. Disc partly to completely visible from above, pale brown to greyish, distinctly pruinose. Proper exciple not visible from above; thalline rim split, lobed to eroded, sometimes slightly layered, often pruinose inside, whitish or with protuberant substratum, concolorous with the thallus externally, slightly incurved to erect or recurved. Exciple fused, thin to evanescent, colourless internally, pale yellowish brown or (pale) brownish marginally, apically often covered with fine greyish granules, non-amyloid. Hymenium to c. 90 µm thick, strongly conglutinated; paraphyses ±straight, parallel to slightly interwoven, slightly thickened apically; lateral paraphyses inconspicuous, to c. 20 µm long. Epihymenium thick, hyaline to pale greyish brown, with greyish granules and crystals. Asci 8-spored; tholus initially thin, absent at maturity. Ascospores transversely septate, fusiform to clavate, rarely oblong, with ±rounded to acute ends, hyaline, non-amyloid, 10–25 × 3–6 µm, with 6–9 locules; locules mostly angular; end cells hemispherical to conical; septa thin, regular to irregular; ascospore wall thin, halonate.
CHEMISTRY: Thallus K–, C–, P–; no compounds detectable by TLC.
  Occurs on the bark of trees in warm-temperate to tropical rainforest in north-eastern Qld and north-eastern N.S.W., at altitudes of c. 800 m; also in the Neotropics.  
  Mangold et al. (2009)  

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

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