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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 astroidea (Berk. & Broome) Cáceres & Lücking

in M.E.Cáceres, Libri Bot. 22: 51 (2007)

Platygrapha astroidea Berk. & Broome, J. Linn. Soc., Bot. 14: 109 (1875); — Ocellularia astroidea (Berk. & Broome) Hale, Mycotaxon 7: 377 (1978); — Thelotrema astroideum (Berk. & Broome) Hale, Mycotaxon 11: 131 (1980).

T: Ceylon [Sri Lanka], G.H.K.Thwaites 629; lecto: K, fide M.E.Hale, Mycotaxon 7: 377 (1978).

Ocellularia alba (Fée) Müll.Arg. var. caesiascens Räsänen, Suom. Elain-ja Kasvit. Seuran Van. Tiedon. Pöytäkirjat 3: 185 (1949). T: Korunda [Kuranda, near Cairns], Qld, Aug. 1893, F.R.M.Wilson s.n.; holo: H; iso: NSW.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, dark olive-green or olive-brown to pale yellowish brown, ±waxy, smooth, continuous, non-rimose. True cortex ±discontinuous, to c. 30 µm thick, pale yellowish, consisting of periclinal to irregular hyphae. Algal layer continuous or discontinuous and poorly developed; calcium oxalate crystals abundant, mostly clustered, sometimes forming layers in the medulla and substratum. Vegetative propagules not seen. Ascomata conspicuous, to c. 2.3 mm diam., to slightly irregular or distinctly irregular (in fused ascomata), markedly chroodiscoid, erumpent, solitary or fused, occasionally in small clusters, sometimes regenerating, immersed. Disc visible from above, greyish, strongly whitish-pruinose. Proper exciple not visible from above; thalline rim split, distinctly lobed, rarely slightly eroded, rarely layered, internally whitish-pruinose, externally concolorous with the thallus, erect to recurved. Exciple fused, thin to evanescent, colourless internally, pale yellowish brown marginally, apically often covered with greyish granules, non-amyloid. Hymenium to c. 80 µm thick, strongly conglutinated; paraphyses ±straight, parallel to slightly interwoven, the tips not thickened to slightly thickened; lateral paraphyses often inconspicuous, to c. 30 µm long; subhymenium often conspicuously dark brown to slightly carbonised. Epihymenium thick, hyaline, with greyish granules and, often, ±large calcium oxalate crystals. Asci 8-spored; tholus initially thin, not visible at maturity. Ascospores transversely septate, fusiform to clavate, often conspicuously narrow, with subacute or acute ends, hyaline, non-amyloid, 9–20 (–23) × 3–5 µm, with 3–7 (–8) locules; locules mostly angular, often ±longitudinally elongate; end cells conical; septa thin, regular; ascospore wall thin, ±distinctly halonate.
CHEMISTRY: Thallus K–, C–, P–; no compounds detectable by TLC.
  Corticolous in rainforest in north-eastern Qld, at altitudes to 900 m; Palaeotropical.  
  Mangold et al. (2009)  

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

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