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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 myriocarpum Fée

Essai Cryptog. Écorc. 94 (1825)

Myriotrema myriocarpum (Fée) Hale, Mycotaxon 11: 134 (1980).

T: “America meridionali, ad corticem Cinchonae rubrae”, coll. unknown; lecto: PC, fide M.E.Hale, Smithsonian Contr. Bot. 38: 45 (1978); isolecto: L.

  Thallus endophloeodal to epiphloeodal, to c. 400 µm thick, usually olive, occasionally pale yellowish green, glossy, smooth, continuous to rugose or verruculose, non-rimose. True cortex continuous, to 30 µm thick, consisting of periclinal hyphae. Algal layer well developed, continuous, often becoming discontinuous due to crystal inclusions; calcium oxalate crystals abundant, small to large, scattered or clustered, occasionally forming columns. Vegetative propagules not seen. Ascomata inconspicuous, to 0.35 mm diam., ±rounded, perithecioid to apothecioid, solitary, immersed to slightly raised. Disc usually becoming partly visible from above, pale greyish to pale flesh-coloured, epruinose. Pores small, to c. 0.25 mm diam., ±rounded to occasionally slightly irregular, the apex of the proper exciple becoming ±visible from above, usually fused, rarely partly to completely free, entire to slightly split, ±whitish to pale brownish, incurved. Thalline rim margin thin, entire, ±rounded, usually paler than the thallus to whitish; thalline rim incurved, concolorous with the thallus, rarely greyish brown, the surface similar to that of the thallus. Proper exciple fused to partly free, mainly thin, hyaline to pale yellowish internally to orange marginally, apically occasionally dark brown, non-amyloid to weakly amyloid at the base. Hymenium to c. 130 µm thick, not inspersed, conglutinated; paraphyses ±straight, ±interwoven, unbranched, the tips thickened; lateral paraphyses inconspicuous, to c. 20 µm long; columellar structures absent. Epihymenium hyaline, rarely with greyish granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores submuriform to muriform, oblong to ellipsoidal or somewhat clavate, with ±rounded to narrowly rounded or subacute ends, hyaline, non-amyloid, rarely faintly amyloid (I+ reddish), 20–30 (–40) × 7–10 µm, with 6–11 (–12) × 1–4 locules; locules ±rounded to angular (immature), subglobose to oblong or mainly ±irregular; transverse septa thin, distinct, regular; ascospore wall thin, non-halonate; endospore thick. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing constictic acid (major), stictic acid (major), a-acetylconstictic acid (minor to trace), cryptostictic acid (minor to trace), a-acetyl-hypoconstictic acid (minor to trace), hypostictic acid (trace).
  Corticolous in rainforest in north-eastern Qld, at altitudes to 900 m; also in the Neotropics.  
  Mangold et al. (2009)  

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

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