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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 emersa (Kremp.) Müll.Arg.

Flora 69: 310 (1886)

Thelotrema emersum Kremp., Flora 59: 221 (1876); Phaeotrema emersum (Kremp.) Zahlbr., Denkschr. Kaiserl. Akad. Wiss. Wien, Math.-Naturwiss. Kl. 83: 119 (1909); Stegobolus emersus (Kremp.) Frisch & Kalb, in A.Frisch, K.Kalb & M.Grube, Biblioth. Lichenol. 92: 452 (2006b).

T: Rio de Janeiro, Brazil, A.Glaziou 3189; holo: M; iso: H-NYL 22435, UPS.

  Thallus endophloeodal to epiphloeodal, to c. 150 µm thick, pale greenish to pale yellowish grey or olive, ±glossy, smooth, verrucose to verruculose, rarely continuous, rimose or not. True cortex continuous, to c. 15 µm thick, formed by periclinal hyphae. Algal layer well developed, continuous; calcium oxalate crystals small to moderately large, scattered. Vegetative propagules not seen. Ascomata conspicuous, to c. 0.9 mm diam., ±rounded to irregular, apothecioid, solitary to marginally fused, moderately to strongly emergent, hemispherical to urceolate. Disc with the columella visible, distinctly pruinose, off-white to brownish, free, entire to reticulate or cracked, especially in older ascomata. Pores formed by the thalline rim margin, small to gaping, to c. 0.7 mm diam., ±rounded to slightly irregular, entire to coarsely split or eroded, then the apex of the proper exciple becoming visible from above as a brownish to dark grey line, moderately thin, concolorous with the thallus; thalline rim incurved to erect in older stages. Proper exciple fused, moderately thin to thick, brownish to distinctly carbonised, occasionally amyloid at the base. Hymenium to c. 100 µm thick, not inspersed, distinctly conglutinated; paraphyses straight to slightly bent, parallel to slightly interwoven, unbranched, with slightly thickened tips; columellar structures well developed, to c. 600 µm wide, replacing large parts of the hymenium, entire to moderately complex, carbonised, covered by whitish or greyish granules. Epihymenium hyaline to slightly brownish, with greyish or brownish granules. Asci 8-spored; tholus thick. Ascospores transversely septate, rarely with a single longitudinal septum, mostly fusiform to oblong-fusiform, with acute to subacute ends, hyaline, distinctly amyloid, 20–35 × 5–7 µm, with 6–12 × 1 (–2) locules; locules ±rounded, subglobose to oblong, with conical end cells; septa moderately thin, regular; ascospore wall thick, non-halonate; endospore rather thick. Pycnidia not seen; according to Frisch et al. (2006) immersed, with a bright to dark pore area; conidia bacilliform, to c. 6 × 1 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (minor to trace), subpsoromic acid (trace).
  Corticolous in rainforest in eastern Qld, at altitudes of 200–530 m; pantropical.  
  Mangold et al. (2009)  

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

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