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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
Thelotrema triseptatum Mangold

in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 658 (2009)

T: Plath Road L.A., 9 km W of Plath Rd, off Kennedy Hwy, Herberton Ra., Atherton Tableland, Qld, alt. 1100 m, 24 June 1983, M.E.Hale 832261; holo: US.

  Thallus endophloeodal to epiphloeodal, to 50 µm thick, greyish, dull to glossy, smooth to slightly uneven, continuous, sparingly rimose or non-rimose. Protocortex discontinuous, to 25 µm thick. Algal layer poorly developed, ±continuous; calcium oxalate crystals sparse, small to large. Vegetative propagules not seen. Ascomata inconspicuous, to 0.3 mm diam., ±rounded, apothecioid, solitary to marginally fused, immersed. Disc not visible from above, rarely partly visible, pale flesh-coloured, epruinose. Pores to c. 0.1 mm diam., ±rounded to slightly irregular, the upper parts of the proper exciple visible from above, free, entire to slightly split, off-white, incurved. Thalline rim margin thick, entire to obscurely split, ±rounded, often slightly sunken, concolorous with the thallus. Proper exciple free in the upper parts, thin, hyaline internally, yellowish orange at the margin, often incorporating bark layers, faintly amyloid. Hymenium to c. 80 µm thick, not inspersed, distinctly conglutinated; paraphyses ±bent, interwoven, unbranched, the tips thickened; lateral paraphyses inconspicuous, to c. 10 µm long; columellar structures absent. Epihymenium indistinct, hyaline, lacking granules but with fine crystals. Asci 8-spored; tholus initially thick, thin to thick at maturity. Ascospores transversely septate, fusiform to clavate, the ends ±rounded to subacute, hyaline, amyloid, 15–20 × 6–7 µm, with 4 locules; locules ±rounded to ±angular, predominantly rounded-cuboid; end cells conical; septa thick, regular; ascospore wall thick, non-halonate. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing stictic acid (major), hypoconstictic acid (trace).
  Very rare on bark in montane rainforest in north-eastern Qld; endemic.  
  Mangold et al. (2009)  

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

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