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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 adjectum Nyl.

Flora 49: 290 (1866)

T: Cuba, C.Wright, ser. 2, 82; lecto: H-NYL 22572, fide M.E.Hale, Smithsonian Contr. Bot. 38: 39 (1978); isolecto: US.

  Thallus predominantly endophloeodal, to c. 70 µm thick, greyish green to pale olive, dull to slightly glossy, smooth to somewhat uneven, continuous to slightly verrucose, rimose or not. Protocortex discontinuous, to c. 10 (–25) µm thick, or the thallus ecorticate. Algal layer well developed, continuous; calcium oxalate crystals abundant, small to large, often clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.4 mm diam., ±rounded, apothecioid, solitary, rarely marginally fused, immersed to slightly emergent, then ±hemispherical. Disc partly visible from above, pale greyish to pale flesh-coloured, epruinose. Proper exciple not visible from above to apically visible, off-white, incurved. Pores small, to c. 0.2 mm diam., ±rounded to irregular, entire to more often split. Thalline rim margin thick, ±rounded to irregular, entire to split to somewhat eroded, slightly layered, inner part off-white to pale brown, outer parts concolorous with the thallus to pale brown (occasionally reddish) due to the protuberant substratum, incurved to erect. Proper exciple fused to apically free, thin to thick, hyaline internally, pale yellowish to pale orange marginally, occasionally incorporating substratum particles, often amyloid at the base. Hymenium to c. 200 µm thick, not inspersed, moderately conglutinated; paraphyses parallel to slightly interwoven, unbranched, the tips unthickened to slightly thickened; lateral paraphyses conspicuous or not, to c. 20 µm long; columellar structures absent. Epihymenium hyaline, lacking granules and crystals, or with fine greyish granules. Asci 4–8-spored; tholus initially thick, thin when mature. Ascospores muriform, mostly fusiform, rarely somewhat clavate, most with narrowly rounded ends, non-amyloid to faintly amyloid, 40–80 × 8–25 µm, with 12–18 × 1–6 locules; locules ±rounded to slightly angular, especially in younger ascospores, subglobular to oblong to somewhat irregular; transverse septa thin, regular to slightly irregular; ascospore wall thick, often thinly halonate; endospore thin. Pycnidia not seen.
CHEMISTRY: Thallus K–, C–, P–; no secondary substances detectable by TLC.
  Uncommon on bark 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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