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 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 |
This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from Australian Biological Resources Study. Requests and inquiries concerning reproduction and rights should be addressed in the first instance to Dr P. McCarthy. These pages may not be displayed on, or downloaded to, any other server without the express permission of ABRS.