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 nostalgicum G.Salisb. | ||
Lichenologist 5: 266 (1972) T: Pidurutalga, Ceylon [Sri Lanka], 15–22 Dec. 1879, E.Almquist s.n.; lecto: H-NYL 22741, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 260 (1981); isolecto: S. |
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| Thallus endophloeodal to epiphloeodal, to c. 200 µm thick, pale greenish grey to olive or yellowish grey, dull to slightly glossy, smooth to slightly uneven, continuous to verruculose, non-rimose or slightly cracked. Algal layer well developed, continuous; calcium oxalate crystals abundant, small, scattered or clustered. Vegetative propagules not seen. Ascomata ±conspicuous, to c. 1.3 mm diam., ±rounded to irregularly rounded, sessile, perithecioid to apothecioid, solitary to marginally fused, becoming emergent, hemispherical or urceolate, with the same surface as the thallus. Disc not visible from above, rarely partly visible, greyish, epruinose to slightly pruinose. Pores small, to c. 0.3 mm diam., ±rounded to slightly irregular, entire to somewhat split, the apex of the proper exciple sometimes becoming visible from above, fused to indistinctly free, rarely somewhat shrunken, off-white or slightly brownish apically, incurved. Thalline rim margin thin to thick, becoming moderately broad, ±rounded to slightly irregular, mainly entire to slightly split, incurved. Proper exciple becoming apically free, thin to thick, hyaline to pale yellowish internally, pale brownish to yellowish brown marginally, apically occasionally darkish grey, sometimes ±distinctly amyloid at the base. Hymenium to c. 300 µm thick, not inspersed, conglutinated; paraphyses ±parallel, unbranched, the tips slightly thickened; lateral paraphyses conspicuous, to c. 40 µm long; columellar structures absent. Epihymenium hyaline, often with greyish granules. Asci 2–4-spored; tholus initially thick, thinning towards maturity. Ascospores transversely septate, cylindrical to fusiform or bifusiform, the ends ±rounded to narrowly rounded, hyaline, faintly to moderately amyloid, 80–240 × 10–25 µm, with 16–38 locules; locules regular, ±rounded, subglobose to lentiform or oblong; end cells hemispherical; septa thin to thick, regular; ascospore wall thick, sometimes with a crenate to ±uneven outline, non-halonate. Pycnidia not seen. CHEMISTRY: Thallus K+ yellowish brown, C–, P+ orange-red; containing fumarprotocetraric acid (major), protocetraric acid (major to trace). |
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| A very rare, corticolous species in montane rainforest (900–1000 m) in south-eastern Qld; also in Sri Lanka. | ||
| Mangold et al. (2009) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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