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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 minutula Hale

Smithsonian Contr. Bot. 38: 24 (1978)

Myriotrema minutulum (Hale) Hale, Mycotaxon 11: 134 (1980).

T: Canal Zone, Panama, M.E.Hale 43341; holo: US.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale greyish to greenish or yellowish grey, dull to ±glossy, smooth to rough, continuous to ±verrucose or verruculose, non-rimose. True cortex discontinuous, to c. 20 µm thick, formed by periclinal hyphae, or the thallus with a continuous or discontinuous protocortex. Algal layer well developed, continuous; calcium oxalate crystals abundant near ascomata, small to moderately large, clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.6 mm diam., ±rounded, perithecioid to indistinctly apothecioid, solitary, immersed to indistinctly raised. Disc not visible from above, the pores eventually filled by the columella tip, pruinose, off-white, free, entire. Pores either formed by the thalline rim margin or the apex of the proper exciple, minute, to c. 0.08 mm diam., ±rounded, entire; visible part of the proper exciple usually fused, rarely slightly detached, occasionally raised and ±annulate, off-white to pale brownish, incurved; thalline rim margin rather thin, concolorous with the thallus or slightly paler; thalline rim incurved. Proper exciple fused to indistinctly free above, thin to evanescent, orange to brownish, dark brown to faintly carbonised apically, usually amyloid at the base. Hymenium to c. 150 µm thick, not inspersed, moderately conglutinated; paraphyses ±bent to curly in upper parts, ±interwoven, unbranched, with slightly thickened tips; columellar structures present in older ascomata, weakly developed, to 100 µm wide, entire, usually overlaying the hymenium, brownish to carbonised above, ±covered by greyish or brownish granules. Epihymenium hyaline, with greyish or brownish granules. Asci 8-spored; tholus thick. Ascospores transversely septate, oblong to ellipsoidal, rarely clavate, with ±rounded to narrowly rounded or subacute ends, hyaline, distinctly amyloid, 20–30 × 6–8 µm, with 4–9 locules; locules ±rounded to slightly angular, oblong to lentiform, with hemispherical to conical end cells; septa moderately thin, regular; ascospore wall thick, non-halonate; endospore thick. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (major to trace), subpsoromic acid (trace).
  Corticolous in forest in northern N.T., eastern Qld and Vic., at altitudes to 1200 m; pantropical and southern-temperate.  
  Mangold et al. (2009)  

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

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