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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 temperatum Mangold

in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 655 (2009)

T: Chaelundi Rd, near Fellabindi Rd, Chaelundi State Forest, 51 km NW of Dorrigo, N.S.W., 4 Apr. 1991, H.Streimann 47489; holo: CANB.

  Thallus endophloeodal to epiphloeodal, to c. 600 µm thick, pale olive to yellowish olive, occasionally with bright speckles, dull to slightly glossy, smooth, ±rugose, usually strongly verrucose to verruculose, usually rimose. True cortex ±continuous, thin, hyaline to slightly yellowish, to c. 25 µm thick, consisting of periclinal to irregular hyphae; occasionally the thallus with a thin ±discontinuous protocortex. Algal layer well developed, continuous; calcium oxalate crystals abundant, often large, clustered, occasionally forming columns. Vegetative propagules not seen. Ascomata to c. 0.6 mm diam., ±rounded, apothecioid, solitary to marginally or rarely completely fused, immersed to emergent, then usually ±conical. Disc often becoming partly visible from above, pale flesh-coloured, epruinose. Pores to c. 0.4 mm diam., mostly ±rounded, entire; proper exciple not visible from above. Thalline rim margin thick, off-white or brighter than the thallus, sometimes sunken in specimens with mostly immersed ascomata; thalline rim incurved. Proper exciple fused to apically slightly detached, thin to thick, hyaline internally, greyish to pale greyish brown marginally, non-amyloid. Hymenium to c. 100 µm thick, not inspersed, moderately to weakly conglutinated; paraphyses straight, slightly interwoven, with slightly to distinctly thickened tips; lateral paraphyses and columellar structures absent. Epihymenium hyaline, rarely with fine greyish granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, oblong to ellipsoidal or somewhat fusiform, rarely clavate, with ±rounded to subacute ends, hyaline, strongly amyloid, 10–17 × 5–8 µm, with 3–4 (–5) locules; locules ±rounded, oblong to lentiform, with hemispherical to conical end cells; septa thin, regular; ascospore wall thick, usually with a thick halo; endospore thick. Pycnidia immersed or in thallus warts, with a bright-rimmed dark pore. Conidia fusiform, to c. 5 × 2 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (trace), subpsoromic acid (trace).
  Corticolous in rainforest in south-eastern Qld and north-eastern N.S.W., at altitudes of 400–1380 m; endemic.  
  Mangold et al. (2009)  

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

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