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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 megalophthalma (Müll.Arg.) Mangold

in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 654 (2009)

Thelotrema megalophthalmum Müll.Arg., Flora 65: 500 (1882); — Chroodiscus megalophthalmus (Müll.Arg.) Vězda & Kantvilas, in A.Vězda, Lich. Rar. Crit. Exs. 3: [25] (1992)..

T: Toowoomba, Qld, 1882, C.H.Hartmann s.n.; holo: G n.v.; iso: BM.

Thelotrema leucophthalmum Nyl. var. laceratum Räsänen, Suom. Elain-ja Kasvit. Seuran Van. Tiedon. Pöytäkirjat 3: 184 (1949). T: Katoomba, N.S.W., 1889, F.R.M.Wilson s.n.; holo: H.

  Thallus superficial, to c. 200 µm thick, pale greyish green to pale olive or pale grey, ±glossy, smooth, continuous to moderately verrucose or verruculose, non-rimose. Protocortex discontinuous to continuous, to c. 30 µm thick. Algal layer continuous and well developed; calcium oxalate crystals lacking. Vegetative propagules not seen. Ascomata conspicuous, to c. 3 mm diam., ±rounded to slightly irregular, sometimes appearing sparingly branched in fused ascomata, chroodiscoid, erumpent, solitary to fused, regenerating, immersed. Disc partly to more often completely visible from above, variable, dark greyish brown to brownish to pale or distinctly flesh-coloured, epruinose to slightly pruinose. Proper exciple not visible from above; thalline rim margin variable, split in immature ascomata, ragged or lobed, ±concolorous with the thallus or brighter, becoming erect to recurved, the tissue splitting and opening irregularly, breaking away in large fragments; marginal parts finally forming the new thalline rim, off-white to pale yellowish brown, becoming erect to recurved, layered with age. Proper exciple fused, thin, hyaline internally to pale yellowish or yellowish orange marginally, usually the lower exciple extending into a distinct hyaline moderately to strongly amyloid lateral hypothecium. Hymenium to c. 180 µm thick, moderately conglutinated; paraphyses ±straight, ±parallel, the tips not thickened to slightly thickened; lateral paraphyses inconspicuous, to c. 20 µm long. Epihymenium pale to medium brown, with yellowish brown to brownish granules. Asci 8-spored; tholus thin, not visible at maturity. Ascospores muriform, oblong to ellipsoidal or reniform, with rounded to, rarely, narrowly rounded ends, hyaline, non-amyloid, 25–45 (–50) × 8–12 µm, with 8–13 (–15) × 1–6 locules; locules large, ±rounded to angular, ±rectangular or irregular; transverse septa thin, regular; ascospore wall thin, non-halonate; endospore thin.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing stictic acid (major), constictic acid (major to minor), a-acetylhypoconstictic acid (trace), cryptostictic acid (trace), a-acetylconstictic acid (trace), hyposalazinic acid (trace), hypostictic acid (trace).
  Apparently rare in south-eastern Qld, but more common and widely distributed in eastern N.S.W.; grows on tree bark and rock in shaded habitats in temperate and subtropical rainforest and wet-sclerophyll forest at altitudes of 400–1250 m. Also in New Zealand.  
  Mangold et al. (2009)  

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

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