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 | ||
| Melanotrema endomelaenum (Müll.Arg.) Mangold | ||
in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 655 (2009) Ocellularia endomelaena Müll.Arg., Hedwigia 32: 131 (1892). T: Brisbane, Qld, 1891, F.M.Bailey 1641; holo: G; iso: BRI (AQ721218). |
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| Thallus endophloeodal, to c. 100 µm thick, pale grey to yellowish grey, dull, smooth to usually rough and porous, continuous, mainly non-rimose or sparingly rimose. Cortex and pseudocortex absent. Algal layer poorly developed, ±discontinuous; calcium oxalate crystals sparse, small to large, scattered. Vegetative propagules not seen. Ascomata conspicuous in older stages, to c. 2 mm diam., solitary or fused, ±rounded to ±irregular when fused, becoming apothecioid, immersed to raised, particularly in older stages, then broadly urceolate. Disc with the columella visible in mature ascomata, distinctly pruinose, greyish to off-white or slightly yellowish, free or partly fused with the thalline rim, entire to distinctly complex, especially in fused ascomata. Pores moderately broad to gaping, to c. 1 mm diam., ±rounded to slightly irregular, entire; proper exciple becoming apically, rarely completely visible from above, free, occasionally slightly shrunken, pruinose, off-white to slightly yellowish, incurved to recurved in older stages. Thalline rim margin broad to gaping, ±rounded to ±irregular, moderately thick, entire to split or eroded, concolorous with the thallus; thalline rim incurved to erect. Proper exciple free, moderately thin to thick towards the upper parts, dark brownish to entirely carbonised at the base, apically covered by greyish granules, sometimes amyloid at the base. Hymenium to c. 150 µm thick, not inspersed, moderately conglutinated; paraphyses ±bent and interwoven, unbranched, with unthickened to slightly thickened tips; columellar structures well-developed, to 0.7 mm wide, replacing most of the hymenium, entire to markedly complex (especially in fused ascomata), completely carbonised, covered by a ±thick layer of greyish granules. Epihymenium hyaline, with greyish or brownish granules. Asci 8-spored; tholus initially thick, becoming thin. Ascospores transversely septate, clavate, rarely ellipsoidal or fusiform, with ±rounded to acute or apiculate ends, hyaline, strongly amyloid, 20–40 × 8–10 µm, with 6–11 (–12) locules; locules ±rounded to angular, ±lentiform, with hemispherical to conical end cells; septa thin to thick, regular to slightly irregular; ascospore wall thin to thick, distinctly halonate in younger stages; endospore thick. Pycnidia not seen. CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (minor to trace), subpsoromic acid (trace). |
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| Endemic to eastern Qld and north-eastern N.S.W.; grows on bark in open, subtropical and tropical rainforest, rarely in wet-sclerophyll forest and mangroves, at altitudes up to 1200 m. | ||
| Mangold et al. (2009) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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