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Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Myriotrema album Fée

Essai Crypt. Écorc. 104 (1825)

Thelotrema myriotrema Nyl., Mem. Soc. Sci Nat. Cherbourg 5: 107 (1857), nom. nov. pro Myriotrema album Fée; — Thelotrema album (Fée) Nyl., Ann. Sci. Nat., Bot., sér. 5, 7: 315 (1867); — Ocellularia alba (Fée) Müll.Arg., Mém. Soc. Phys. Genève 29(8): 6 (1887).

T: “America meridionali, ad corticem Bonplandiae trifoliatae (Wild.)” [South America]; lecto: G-Fée 249, fide M.E.Hale, Smithsonian Contr. Bot. 38: 12 (1978); isolecto: H-NYL 22635.

  Thallus endophloeodal to epiphloeodal, to c. 500 µm thick, pale olive to yellowish olive, often with paler patches due to the uneven algal layer, ±glossy, smooth, continuous to rugose, non-rimose. True cortex continuous, slightly yellowish, to c. 40 µm thick, consisting of periclinal to irregular hyphae, sometimes patchily non-conglutinated and forming a protocortex. Algal layer well developed, usually continuous, sometimes partly thinning or lacking; calcium oxalate crystals usually abundant, occasionally lacking, small to large, clustered, sometimes forming thin layers or scattered clusters; medulla distinct. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.35 mm diam., ±rounded, apothecioid, solitary to marginally or, rarely, completely fused, often clustered or forming patches of densely aggregated ascomata; in some specimens the ascomata sometimes becoming stroma-like, then often sharing the same thalline rim, predominantly immersed, rarely somewhat emergent, then hemispherical. Disc often becoming partly visible from above, pale flesh-coloured, epruinose to slightly pruinose. Pores usually small, occasionally broad, to c. 0.2 mm wide, mostly ±rounded to somewhat irregular, entire, rarely slightly split; proper exciple usually not visible from above, in distinctly fused ascomata becoming visible, entire, erect, off-white. Thalline rim margin usually ±thin, rarely thick, brighter than the thallus, forming a narrow to moderately broad off-white ring-like area, level with the thallus to often somewhat raised, rarely sunken; thalline rim usually incurved. Proper exciple fused, usually thin, hyaline internally, pale yellowish to yellowish brown marginally, non-amyloid. Hymenium to c. (80–) 100 µm thick, not inspersed, strongly conglutinated; paraphyses straight to sparingly branched, distinctly septate, slightly interwoven, with thickened irregular tips; lateral paraphyses and true columella lacking; columella-like structures present in fused ascomata. Epihymenium hyaline, occasionally with fine greyish granules. Asci 8-spored; tholus thick, becoming thin at maturity. Ascospores transversely septate, occasionally with a single longitudinal septum, ellipsoidal to fusiform or clavate, hyaline, amyloid, 10–25 (–28) × 4–9 µm, with 3–8 × 1 (–2) locules; locules ±rounded to somewhat acute, subglobose to lentiform or irregular, with similar to hemispherical or conical end cells; septa thin to thick, often irregular; ascospore wall thick, occasionally with a thin halo; endospore thin to thick. Pycnidia in thalline warts, with a brownish pore area surrounded by a pale zone. Conidia bacilliform, to c. 8 × 1 µm.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Commonon bark in rainforest in eastern Qld and north-eastern N.S.W., at altitudes to 1230 m; pantropical and subtropical.  
  Mangold et al. (2009)  

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

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