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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 eminens (Hale) Hale

Mycotaxon 11: 133 (1980)

Thelotrema eminens Hale, Mycotaxon 3: 177 (1975).

T: Pahang, Malaysia, M.E.Hale 29947; holo: US.

  Thallus endophloeodal to epiphloeodal, to c. 100 µm thick, greyish white to pale yellowish grey, ±glossy, smooth, continuous, non-rimose to slightly rimose. True cortex ±continuous, to c. 20 µm thick, moderately dense, formed by periclinal hyphae. Algal layer poorly developed, ±continuous; calcium oxalate crystals sparse to absent. Isidia often present, concolorous with the thallus, cylindrical, sparingly branched, to c. 1.3 mm long, to c. 0.2 mm thick. Ascomata conspicuous, to c. 0.8 mm diam., mostly ±rounded, perithecioid, marginally fused, forming clusters of few to several ascomata, distinctly emergent, subglobose to urceolate. Disc not visible from above. Pores small, to c. 0.2 mm diam., ±rounded to irregular, entire to slightly split; apex of proper exciple usually not visible from above, rarely becoming visible if partly detached, entire to slightly split, incurved, whitish; pore area occasionally sunken, concolorous with the thalline rim or somewhat darker. Thalline rim margin thick, entire or sometimes slightly cracked, depressed to slightly annular, concolorous with the thallus or pale yellowish. Proper exciple fused, apically occasionally becoming free, thick, orange internally, reddish to reddish brown marginally, non-amyloid. Hymenium to c. 250 µm thick, not inspersed, strongly conglutinated; paraphyses thick, parallel, sparingly branched towards the exciple, often distinctly curly distally, with thickened tips; lateral paraphyses and columellar structures absent. Asci 1 (–2)-spored; tholus initially thin, not visible at maturity. Ascospores muriform, oblong to ±rounded-fusiform, with ±rounded to narrowly rounded ends, often somewhat irregular in outline, hyaline, strongly amyloid, 150–200 × 25–50 µm, with numerous locules; locules small, ±rounded to slightly angular, ±subglobose; transverse septa thin, irregular, evanescent; ascospore wall thin, non-halonate; endospore thin. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing constictic acid (major), stictic acid (major), hypostictic acid (minor), hypoconstictic acid (trace), cryptostictic acid (trace).
  Rare on tree bark in rainforest in north-eastern Qld, at altitudes of 530–1000 m; also in Sri Lanka, Malaysia and the Philippines.  
  Mangold et al. (2009)  

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

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