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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 arecae (Vain.) Hale

Mycotaxon 11: 136 (1980)

Thelotrema arecae Vain., Hedwigia 46: 174 (1907); — Leptotrema arecae (Vain.) Zahlbr., Cat. Lich. Univ. 2: 631 (1923).

T: Koh Chang Island, Thailand, J.Schmidt 21; holo: TUR-V 26767; iso: C.

  Thallus endophloeodal to epiphloeodal, to c. 400 µm thick, pale greenish grey to yellowish grey, dull to glossy, smooth or rough, strongly verrucose, rimose or not, often the white medulla becoming exposed especially near ascomata. True cortex continuous, to c. 30 µm thick, formed by irregular to periclinal hyphae, or the thallus with a discontinuous protocortex. Algal layer well developed, continuous; calcium oxalate crystals moderately large to large, clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 1.5 mm diam., ±rounded to irregular, perithecioid to obscurely apothecioid, solitary or fused, strongly emergent, ±verrucose and irregular to hemispherical or depressed-subglobose. Disc not visible from above, the pores becoming filled by the columella tip, entire, free, medium to dark grey, epruinose to slightly pruinose. Pores formed by the thalline rim margin, to c. 0.3 mm diam., ±rounded, more often irregular, entire to slightly split or evanescent, then the apical proper exciple becoming visible from above as a brownish to darkish grey line, otherwise concolorous with the thallus, moderately thin to moderately thick, often depressed to distinctly sunken; thalline rim incurved. Proper exciple fused, yellowish brown to brownish internally and at the base, dark brown to strongly carbonised marginally and in the upper parts, prosoplectenchymatous, occasionally amyloid at the base. Hymenium to c. 300 µm thick, not inspersed, moderately conglutinated; paraphyses moderately bent, parallel to slightly interwoven, unbranched, with unthickened tips; columellar structures variable, to 300 µm wide, entire, sometimes partly overlaying the hymenium, distinctly carbonised, with or without a thin layer of greyish granules. Epihymenium hyaline, lacking granules. Asci 1-spored; tholus absent; lateral walls initially thick, becoming thin. Ascospores muriform, oblong-ellipsoidal, with strongly tapered ends forming short appendices, hyaline to yellowish or becoming pale brownish grey, strongly amyloid, 100–250 (–270) × 25–40 µm, with numerous locules; locules ±angular, subglobose or irregular; transverse septa thin, distinct, regular; ascospore wall and endospore initially thin to moderately thick; apices with a thick halo, elsewhere the halo absent or thin. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; containing hypoprotocetraric (major), 2-hydroxyhypoproto-cetraric acid (major), 2-hydroxynornotatic acid (minor), 4-O-demethylnotatic acid (minor to trace), convirensic acid (minor to trace), conhypoprotocetraric acid (minor to trace).
  Rather common on bark and dead wood in open sites in rainforest, also in mangroves and monsoon forest in northern N.T. and north-eastern Qld; from sea level to 800 m; also in Thailand.  
  Mangold et al. (2009)  

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

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