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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 phaeosporum (Nyl.) Hale

Mycotaxon 11: 134 (1980)

Thelotrema phaeosporum Nyl., Ann. Sci. Nat., Bot., sér. 4, 11: 242 (1859); — Leptotrema phaeosporum (Nyl.) Müll.Arg., Flora 65: 499 (1882).

T: Port Carteret, New Ireland, [Papua] New Guinea, Lesson s.n.; iso: G, US.

  Thallus epiphloeodal, to c. 1 mm thick, bulging and flaking away from the substratum, pale greenish grey to pale yellowish green, ±dull, smooth, continuous, with a grainy-speckled surface, usually non-rimose, occasionally slightly rimose. True cortex absent; protocortex continuous or discontinuous, to c. 30 µm thick. Algal layer usually well developed, usually continuous, rarely discontinuous due to crystal inclusions; calcium oxalate crystals abundant, large, clustered, sometimes in columns. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.4 mm diam., ±round, perithecioid, solitary, immersed. Disc not visible from above. Pores minute to small, to c. 0.1 mm diam., ±rounded, entire; apex of proper exciple becoming visible from above, forming a fused to indistinctly free inner pore margin, incurved, bright-translucent to pale brownish, in older ascomata often thin and appearing darker. Thalline rim margin thick, ±rounded, entire, often brighter than the thallus, not visible from above. Proper exciple fused to apically slightly detached, thin to thick, pale yellowish internally, pale orange marginally, non-amyloid. Hymenium to c. 150 µm thick, not inspersed, weakly conglutinated; paraphyses ±bent to distinctly curly distally, sometimes with ±distinct septation, moderately interwoven, with unthickened to slightly thickened tips; lateral paraphyses and columellar structures absent. Epihymenium hyaline, without granules. Asci 8-spored; tholus distinctly narrowed when immature, thin to not visible at maturity. Ascospores muriform, occasionally submuriform, oblong to ellipsoidal, rarely somewhat fusiform, with rounded to narrowly rounded or subacute ends, becoming brown at early maturity, faintly to distinctly amyloid only when immature, 10–25 × 7–15 µm, with 4–8 × 1–4 (–5) locules; locules ±rounded to slightly angular, oblong to subglobose or somewhat irregular; end cells having the same shape; transverse septa thin to thick, regular to irregular; ascospore wall thick, non-halonate; endospore thin. Pycnidia not seen.
CHEMISTRY: Pigments K+ purple-orange; containing five unknown pigments
  Thallus K+ yellow, C–, P+ orange; containing constictic acid (major), stictic acid (major), cryptostictic acid (minor to trace), hypoconstictic acid (minor to trace), hypostictic acid (minor to trace).  
  Mangold et al. (2009)  

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

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