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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
Ocellularia subcavata (Nyl.) Zahlbr.

Cat. Lich. Univ. 2: 601 (1923)

Thelotrema subcavatum Nyl., Flora 59: 561 (1876); — Stegobolus subcavatus (Nyl.) Frisch, in A.Frisch, K.Kalb & M.Grube, Biblioth. Lichenol. 92: 491 (2006).

T: Cuba, C.Wright, Lich. Cub. 509; holo: H-NYL 22813.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale greenish to pale yellowish grey or olive, ±glossy, smooth, continuous to verrucose, ±rimose. True cortex continuous or discontinuous, to c. 30 µm thick, formed by periclinal hyphae. Algal layer well developed, usually continuous, occasionally discontinuous due to crystal inclusions; calcium oxalate crystals abundant, large, scattered or clustered. Vegetative propagules not seen. Ascomata ±conspicuous, to c. 1.5 mm diam., ±rounded to irregular (especially fused ascomata), apothecioid, solitary to fused, emergent, hemispherical to urceolate or subglobose. Disc with the columella visible from above, markedly pruinose, off-white to pale reddish, free or fused with the thalline rim, entire. Pores formed by the thalline rim margin, to c. 0.4 mm diam., ±rounded to irregular, sometimes annulate, moderately thin to thick, entire to split or evanescent, then the proper exciple becoming visible from above as a brownish line, otherwise paler than the thallus or off-white; thalline rim incurved. Proper exciple fused, moderately thin to thick, brownish to carbonised, sometimes amyloid at the base. Hymenium to c. 130 µm thick, not inspersed, distinctly conglutinated; paraphyses straight to slightly bent, parallel to interwoven, unbranched, with slightly thickened tips; columellar structures well developed, c. 800 µm wide, replacing much of the hymenium, entire, carbonised, covered with a thick layer of whitish or greyish granules. Epihymenium hyaline to brownish, with greyish or brownish granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, oblong to ellipsoidal or clavate, with ±rounded to subacute ends, hyaline, distinctly amyloid, 10–25 × 5–8 (–10) µm, with 4–8 (–10) locules; locules ±rounded, oblong to lentiform, with hemispherical to conical end cells; septa thick, regular; ascospore wall thick, non-halonate; endospore thick. Pycnidia not seen; fide Frisch et al. (2006) emergent with a pale or rather dark pore; conidia bacilliform, to 8 × 1.5 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (minor to trace), subpsoromic acid (minor to trace).
  Corticolous in rainforest in eastern Qld and N.S.W., at altitudes to 1200 m. Reported for the first time from Australia; mainly pantropical.  
  Mangold et al. (2009)  

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

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