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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 nureliyum Hale

Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 261 (1981)

T: Central Province, Sri Lanka, M.E.Hale 50292; holo: US.

  Thallus endophloeodal to epiphloeodal, to c. 300 µm thick, pale greenish grey to olive or yellowish grey, mainly dull, smooth to uneven, sometimes porous, continuous to strongly verruculose and sometimes forming subglobose isidia-like structures, strongly rimose. Protocortex ±continuous, to c. 25 µm thick. Algal layer well developed, continuous; calcium oxalate crystals abundant, small, scattered or clustered. Vegetative propagules not seen; isidia-like structures sometimes present. Ascomata ±conspicuous, mostly large, to c. 1.2 mm diam., ±rounded to irregularly rounded, apothecioid, somewhat erumpent, solitary to marginally fused, becoming emergent, hemispherical to urceolate. Disc often becoming partly to completely visible from above, pale greyish to whitish, ±strongly pruinose. Pores small to moderately small, to c. 0.4 mm diam., ±rounded to slightly irregular, entire to split, the apical part or all of the proper exciple becoming visible from above, often somewhat shrunken, off-white or slightly brownish apically, concolorous to pale brownish towards the base, incurved to erect, rarely slightly recurved. Thalline rim margin thin to thick, becoming rather wide to gaping, ±rounded to slightly irregular, usually entire to split, sometimes lacerate or eroded, often distinctly layered, incurved to erect, concolorous with the thallus in layered margins; inner layers usually paler. Proper exciple becoming completely free, thick, hyaline to pale yellowish internally, pale brownish to yellowish brown marginally, apically usually dark grey and covered by granules, often distinctly amyloid at the base. Hymenium to c. 250 µm thick, not inspersed, conglutinated; paraphyses ±parallel, unbranched, the tips markedly thickened; lateral paraphyses conspicuous, to c. 40 µm long; columellar structures absent. Epihymenium hyaline, with pale to dark grey granules and rather small crystals. Asci 4–8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, rarely with a single longitudinal septum, cylindrical to fusiform, sometimes bifusiform, the ends ±rounded to narrowly rounded, hyaline, becoming faintly yellowish when decayed, mostly slightly to moderately amyloid, 60–220 × 10–20 µm, with 12–35 × 1 (–2) locules; locules ±rounded, subglobose to lentiform or oblong, rarely biconcave; end cells hemispherical; septa thin to thick, regular; ascospore wall thick, usually with a crenate to ±irregular outline, non-halonate. Pycnidia not seen; according to Matsumoto & Deguchi (Bryologist 102: 86–91, 1999) immersed, with a dark pore area; conidia oblong, to 2.4 × 0.8 µm.
CHEMISTRY: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  On bark in forest in eastern Qld and N.S.W., at altitudes to 1500 m; Palaeotropical and subtropical, including Lord Howe Island.  
  Mangold et al. (2009)  

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

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