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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
Myriotrema olivaceum Fée

Essai Crypt. Écorc. tab. 1, fig. 25 (1825)

Ocellularia olivacea (Nyl.) Müll.Arg., Mém. Soc. Phys. Genève 29(8): 7 (1887); — Ocellularia olivacea (Nyl.) Overeem, in C.Overeem-de Haas & D.Overeem-de Haas, Bull. Jard. Bot. Buitenzorg, sér. 3, 4: 118 (1922), nom. superfl.

T: [South America]; lecto: G-Fée 250 n.v., fide M.E.Hale, Smithsonian Contr. Bot. 16: 24 (1974).

  Thallus predominantly epiphloeodal, to c. 600 µm thick, initially pale to medium olive, becoming greyish or greenish grey to yellowish brown, dull to glossy, smooth, continuous to rugose, becoming markedly rimose or areolate. True cortex continuous or discontinuous, hyaline, to c. 40 µm thick, consisting of periclinal to somewhat irregular hyphae, sometimes replaced by a thin often discontinuous protocortex. Algal layer well developed, continuous; calcium oxalate crystals lacking or sparse, small and clustered; medulla distinct. Vegetative propagules not seen. Ascomata abundant, to c. 0.3 mm diam., ±rounded, apothecioid, solitary to marginally fused, mostly immersed to slightly raised. Disc not visible from above, very rarely becoming partly visible, pale flesh-coloured, epruinose. Pores to c. 0.1 mm diam., ±rounded to irregular, mostly ±split; proper exciple usually becoming apically to rarely entirely visible from above, off-white, usually shrunken, incurved. Thalline rim margin rather broad, ±rounded to somewhat irregular, thin to thick, entire to ±split, often ±distinctly raised, whitish or brighter than the thallus, incurved. Proper exciple usually becoming free in upper parts, thin, with a thin hyaline to pale yellowish area internally, orange to pale brown marginally, in older stages often brown apically, occasionally faintly amyloid in lower parts. Hymenium to c. 90 µm thick, not inspersed, moderately conglutinated; paraphyses somewhat irregular, ±interwoven, with slightly thickened tips; lateral paraphyses absent, but the apical exciple sometimes forming similar structures due to radiating hyphae; columellar structures absent. Epihymenium hyaline, without granules. Asci 8-spored; tholus initially thick, thinning or not visible at maturity. Ascospores transversely septate, oblong to ellipsoidal, somewhat fusiform when immature, with ±rounded to narrowly rounded or subacute ends, hyaline, strongly amyloid, 10–15 × 5–7 µm, with 3–4 (–5) locules; locules ±rounded to slightly angular, subglobose to oblong to lentiform, with similar-shaped, more hemispherical or conical end cells; septa thin, regular; ascospore wall thick, non-halonate; endospore thick. Pycnidia not seen.
CHEMISTRY: Strain I: Thallus K+ red, C–, P–; containing olivaceic acid (major), norsubnotatic acid (major to minor). Strain II: Thallus K–, rarely reddish, C–, P–; containing O-methyl-olivaceic acid (major), norisonotatic acid (major), olivaceic acid (minor).
  A common, corticolous species in northern N.T. and eastern Qld; grows in rainforest, coastal forest, mangroves and monsoon forest at altitudes to 1200 m; pantropical.  
  Mangold et al. (2009)  

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

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