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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 diacida Hale

Mycotaxon 7: 378 (1978)

T: Karnataka, India, M.E.Hale 47933; holo: US.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, greyish to greenish grey or pale olive, dull to glossy, smooth, continuous to verrucose or verruculose, rimose or not; verrucae near ascomata often eroded, exposing the white to yellowish or pale orange medulla. True cortex discontinuous, to c. 20 µm thick, formed by irregular hyphae, in part not conglutinated and forming a protocortex. Algal layer well developed, continuous; calcium oxalate crystals moderately large and scattered. Vegetative propagules not seen. Ascomata ±inconspicuous, to c. 0.8 mm diam., ±rounded, but usually irregular, apothecioid when mature, solitary to marginally fused, immersed to moderately emergent, then verrucose-hemispherical to urceolate. Disc with the columella visible from above in mature ascomata, entire, free, slightly pruinose, rather dark grey. Pores formed by the thalline rim margin, to c. 0.3 mm diam., ±rounded to irregular, entire to split or evanescent, then the apex of the proper exciple becoming visible from above as a brownish line, moderately thin to moderately thick, concolorous with the thallus; thalline rim incurved. Proper exciple fused, pale to medium brown internally, dark brown to distinctly carbonised marginally and towards the tips, usually strongly amyloid at the base. Hymenium to c. 130 µm thick, not inspersed, distinctly conglutinated; paraphyses slightly bent, ±interwoven, unbranched, with moderately thickened tips; columellar structures moderately developed, to 200 µm wide, entire, brownish to carbonised in the upper parts, ±covered with greyish granules. Epihymenium brownish, with greyish or brownish granules. Asci 8-spored; tholus initially thick, moderately thin when mature. Ascospores transversely septate, oblong to fusiform, with ±rounded to subacute ends, hyaline, occasionally slightly brownish with age, distinctly amyloid, 15–40 × 6–9 µm, with 4–12 locules; locules ±rounded to slightly angular, oblong to ±lentiform, with hemispherical to conical end cells; septa moderately thick; ascospore wall and endospore moderately thick; wall non-halonate. Pycnidia not seen.
CHEMISTRY: Thallus K+ orange, C–, P–; containing hirtifructic acid (major), conhirtifructic acid (major), the main ‘cinchonarum unknown’ (major to trace), and the ‘cinchonarum unknown’ accessory compound ‘spot 1’ (trace).
  Grows on bark in rainforest in north-eastern Qld, at altitudes to 800 m; Palaeotropical.  
  Mangold et al. (2009)  

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

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