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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 rugiferum (Harm.) Hale

Mycotaxon 11: 135 (1980)

Thelotrema rugiferum Harm., Bull. Soc. Sci. Nancy, sér. 3, 13: 44 (1912).

T: New Caledonia, R.P.Pionnier 42; lecto: DUKE, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 292 (1981); isolecto: S.

  Thallus endophloeodal to epiphloeodal, to c. 400 µm thick, pale olive to greyish green, yellowish grey or greyish, glossy, smooth, continuous to more often rugose and/or distinctly verruculose, non-rimose to coarsely cracked. True cortex continuous, slightly yellowish, to c. 30 µm thick, consisting of periclinal hyphae, occasionally partly non-conglutinated and forming a protocortex. Algal layer well developed, continuous; calcium oxalate crystals sparse to abundant, large, clustered; medulla distinct. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.4 mm diam., ±rounded to irregular in fused ascomata, apothecioid, solitary to fused, mostly immersed, rarely somewhat emergent and hemispherical to conical. Disc usually not visible from above, pale flesh-coloured, strongly whitish-pruinose. Pores to c. 0.1 (–0.2) mm diam., mostly irregular and ±split; proper exciple becoming apically to, rarely, completely visible from above, whitish, shrunken, incurved. Thalline rim margin becoming moderately broad or gaping, ±rounded to somewhat irregular, thin, entire to slightly split, whitish; thalline rim incurved, very rarely erect. Proper exciple free in upper parts, thin, hyaline internally to brownish or greyish brown marginally, often with a ±thick apical layer of greyish granules, non-amyloid. Hymenium to c. 90 (–110) µm thick, not inspersed, strongly conglutinated; paraphyses bent, unbranched to sparingly branched towards the exciple, slightly to moderately interwoven, with ±thickened irregular tips; lateral paraphyses and true columella absent; columella-like structures sometimes present in fused ascomata. Epihymenium hyaline, with fine to coarse greyish granules. Asci (4–) 8-spored; tholus initially thick, thin when mature. Ascospores submuriform, subglobose to oblong or ellipsoidal, rarely fusiform, with rounded to narrowly rounded or subacute ends, hyaline, strongly amyloid, 15–25 × 7–10 µm, with 4–6 (–7) × 1–3 (–4) locules; locules ±rounded to slightly angular, subglobose to oblong or somewhat irregular; end cells the same shape or hemispherical; transverse septa distinct, thin, regular to irregular; ascospore wall thick, non-halonate; endospore thick. Pycnidia immersed in thallus warts, with a colourless to dark pore surrounded by a whitish ring. Conidia fusiform to somewhat irregular, to c. 5 × 1.5 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (major to minor), subpsoromic acid (trace).
  Common on bark in lowland and montane rainforest, coastal forest and mangroves, rarely in wet-sclerophyll forest, at altitudes to 1200 m in eastern Qld and north-eastern N.S.W.; mainly pantropical.  
  Mangold et al. (2009)  

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

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