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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 schizostoma (Tuck.) Müll.Arg.

Nuovo Giorn. Bot. Ital. 23: 395 (1891)

Thelotrema schizostomum Tuck., Proc. Amer. Acad. Arts Sci. 5: 411 (1862); — Myriotrema schizostomum (Tuck.) Hale, Mycotaxon 11: 135 (1980); — Stegobolus schizostomus (Tuck.) Frisch & Kalb, in A.Frisch, K.Kalb & M.Grube, Biblioth. Lichenol. 92: 487 (2006).

T: Cuba, C.Wright, Lich. Cub. 138; lecto: FH-TUCK, fide A.Frisch, K.Kalb & M.Grube, Biblioth. Lichenol. 92: 487 (2006).

Thelotrema latilabrum Tuck., Proc. Amer. Acad. Arts Sci. 6: 269 (1866); Ocellularia latilabra (Tuck.) Müll.Arg., J. Linn. Soc. London, Bot. 30: 452 (1895); Rhabdodiscus latilabrus (Tuck.) Vain., Ann. Acad. Sci. Fenn., ser. A, 15(6): 184 (1921). T: Cuba, C.Wright, Lich. Cub. 137; iso: BM, US.

  Thallus endophloeodal to epiphloeodal, to c. 300 µm thick, pale greyish to olive, dull to glossy, smooth, continuous to verrucose or verruculose, ±rimose. True cortex patchy, to c. 20 µm thick, formed by periclinal hyphae. Algal layer well developed, continuous, appearing discontinuous due to crystal inclusions; calcium oxalate crystals abundant, moderately large, scattered or clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 2.5 mm diam., ±rounded to irregular or sparingly branched in fused ascomata, apothecioid to chroodiscoid, solitary to fused or distinctly clustered, with several ascomata sharing a common thalline rim, ±distinctly emergent, urceolate. Disc and columella visible from above in mature ascomata; disc greyish-pruinose; columella whitish-pruinose, often fused with the thalline rim, entire to reticulate, especially in clustered ascomata. Pores small to gaping, to c. 1 mm diam., ±rounded to irregular, either formed by the proper exciple, ±free in upper parts, entire, ±jagged, whitish and ±erect, or formed by the thalline rim margin, then the margin strongly pruinose and the proper exciple not visible. Thalline rim margin broad to gaping, ±rounded to irregular, moderately thick, becoming coarsely split, and occasionally lobed, or eroded with age, internally whitish and covered by a ±thick pruina, concolorous with the thallus or brighter to distinctly brownish towards the margins; thalline rim initially erect, later strongly recurved. Proper exciple fused to apically free, thick, yellowish brown to brownish internally to dark brown or carbonised marginally, apically covered by greyish granules, often amyloid at the base. Hymenium to c. 150 µm thick, not inspersed, distinctly conglutinated; paraphyses ±bent, often curly towards the tips, parallel to slightly interwoven, unbranched, with slightly thickened tips; columellar structures well-developed, to 300 µm wide, often replacing large parts of the hymenium, entire to complex, especially in fused ascomata, carbonised, covered with a ±thick layer of greyish or brownish granules. Epihymenium brownish, with greyish or brownish granules. Asci 8-spored; tholus initially thick, moderately thin when mature. Ascospores transversely septate, rarely with a single longitudinal septum, oblong to fusiform or clavate, with ±rounded to subacute ends, hyaline, distinctly amyloid, 20–35 × 7–10 µm, with 6–9 × 1 (–2) locules; locules ±rounded to slightly angular, oblong to lentiform; septa moderately thin, regular; ascospore wall and endospore moderately thick; wall non-halonate. Pycnidia not seen; fide Frisch et al. (2006) immersed or in thallus warts with a pale to darkish pore area; conidia bacilliform, to c. 8 × 1.5 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (major to trace), subpsoromic acid (trace).
  Corticolous in montane rainforest and wet-sclerophyll forest in eastern Qld and north-eastern N.S.W.; mainly pantropical.  
  Mangold et al. (2009)  

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

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