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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 subconforme (Nyl.) Hale

Mycotaxon 11: 135 (1980)

Thelotrema subconforme Nyl., J. Linn. Soc. London, Bot. 20: 53 (1883).

T: Malacca, [Malaysia], May 1864, A.C.Maingay 64; lecto: BM, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 294 (1981); isolecto: FH-TUCK, H-NYL 22587.

  Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale olive to greyish green, glossy, smooth, rugose and/or distinctly verrucose to verruculose, rimose or not. True cortex continuous, to c. 60 µm thick, consisting of periclinal hyphae. Algal layer well developed, continuous, becoming disrupted due to crystal inclusions; calcium oxalate crystals abundant, small to large, scattered or clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.2 mm diam., ±rounded, apothecioid, solitary to slightly fused, immersed. Disc not visible from above, rarely becoming partly visible, pale flesh-coloured, distinctly pruinose. Pores to c. 0.05 (–0.08) mm diam., irregular and ±split; proper exciple becoming apically to rarely entirely visible from above, whitish, shrunken, incurved. Thalline rim margin small, ±rounded to somewhat irregular, thin, entire to split, whitish or brighter than the thallus, flush with the thallus to somewhat raised; thalline rim incurved. Proper exciple free in upper parts, thin, hyaline internally, pale yellowish to yellowish brown marginally, often greyish or darker apically, non-amyloid. Hymenium to c. 80 µm thick, not inspersed, strongly conglutinated; paraphyses bent, unbranched to sparingly branched towards the exciple, moderately interwoven, with slightly to distinctly thickened irregular tips; lateral paraphyses and columellar structures absent. Epihymenium hyaline, with greyish granules. Asci 8-spored; tholus initially thick, thin at maturity. Ascospores submuriform, oblong to ellipsoidal, rarely fusiform or clavate, with ±rounded to subacute ends, hyaline, moderately to strongly amyloid, 10–18 (–20) × 6–9 µm, with 4–6 × 1–3 (–4) locules; locules ±rounded to angular, subglobose to oblong or irregular, with hemispherical to conical end cells; transverse septa distinct, thin to thick, becoming irregular; ascospore wall thick, non-halonate at maturity; endospore thick. Pycnidia not seen.
CHEMISTRY:Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Common on tree bark in northern N.T. and north-eastern Qld; found in coastal rainforest, mangroves and monsoon forest from sea level to 150 m. Palaeotropical.  
  Mangold et al. (2009)  

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

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