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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 orthomastia (Kremp.) Zahlbr.

Cat. Lich. Univ. 2: 597 (1923)

Ascidium orthomastium Kremp., Nuovo Giorn. Bot. Ital. 7: 60 (1875).

T: Singapore, O.Beccari 247; lecto: M, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 316 (1981).

  Thallus epiphloeodal, to c. 200 µm thick, pale greenish grey to pale olive, dull to slightly glossy, smooth, continuous to verrucose or verruculose, rimose. True cortex ±discontinuous, to c. 30 µm thick, formed by periclinal hyphae. Algal layer well developed, continuous; calcium oxalate crystals abundant, small to moderately large, scattered. Vegetative propagules not seen. Ascomata ±conspicuous, to c. 0.8 mm diam., ±rounded to slightly irregular, apothecioid at maturity, solitary to marginally fused, moderately to distinctly emergent, often verrucose and hemispherical to urceolate. Disc with the columella visible in older stages, epruinose to slightly pruinose, off-white to brownish or dark grey, free to fused with the thalline rim, entire. Pores formed by the thalline rim margin, to c. 0.4 mm diam., ±rounded to irregular, sometimes depressed, entire to split or eroded to evanescent, then the apex of the proper exciple becoming visible from above as a brownish to dark grey line, thin to thick, concolorous with the thallus or brighter; thalline rim incurved. Proper exciple fused, thin to thick, yellowish brown to brownish internally, dark brown to carbonised marginally and above, often amyloid at the base. Hymenium to c. 180 µm thick, not inspersed, conglutinated; paraphyses straight to slightly bent, parallel to slightly interwoven, unbranched, with scarcely thickened tips; columellar structures well-developed, to c. 500 µm wide, entire, carbonised, sometimes covered with greyish granules. Epihymenium hyaline, with brownish granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, mostly fusiform to oblong-fusiform, with acute to subacute ends, hyaline, amyloid, 40–70 × 7–13 µm, with 12–17 locules; locules ±rounded to slightly angular in younger stages, then ±lentiform to oblong or rectangular, with hemispherical to conical end cells; septa moderately thick, regular; ascospore wall and endospore moderately thick; wall halonate at the apices. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no compounds detectable by TLC.
  Rare on bark in lowland rainforest in north-eastern Qld; Palaeotropical.  
  Mangold et al. (2009)  

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

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