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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 foveolare Müll.Arg.

Nuovo Giorn. Bot. Ital. 23: 129 (1891)

T: Tosa, Japan, Yoshinaza 26; holo: G.

  Thallus endophloeodal to epiphloeodal, to c. 150 µm thick, greyish to yellowish or greenish grey, dull, smooth, continuous to verrucose, rimose, occasionally appearing areolate due to cracking of the substratum. Protocortex usually present, discontinuous to c. 20 µm thick. Algal layer poorly developed, discontinuous; calcium oxalate crystals abundant near ascomata, otherwise sparse, small to large, clustered. Vegetative propagules not seen. Ascomata conspicuous, to 1.2 mm diam., ±rounded to slightly irregular, perithecioid when immature, becoming apothecioid, solitary to marginally fused, ±distinctly emergent, mostly irregularly subglobose to urceolate, occasionally depressed-cylindrical. Disc not visible from above. Pores opening late, small, to c. 0.4 mm, ±rounded to irregular, the apex of the proper exciple visible from above, becoming completely free, off-white, often shrunken, incurved to somewhat erect. Thalline rim margin ±rounded to irregular, thick, broad to gaping, predominantly entire, incurved, concolorous with the thallus to brownish (due to the protuberant substratum). Proper exciple becoming free, thick, hyaline internally, pale brownish to brownish grey or greyish marginally, apically often covered by greyish granules, non-amyloid. Hymenium to c. 300 µm thick, not inspersed, moderately conglutinated; paraphyses parallel or slightly interwoven, unbranched, the tips moderately to distinctly thickened; lateral paraphyses inconspicuous, to c. 20 µm long; columellar structures absent. Epihymenium variably thick, initially indistinct, thickening in older ascomata, hyaline, with fine to coarse greyish or greyish brown granules. Asci 1-spored; tholus absent; lateral walls initially thickened, becoming thin proximally. Ascospores muriform, mostly fusiform, with narrowly rounded to subacute ends, hyaline, rarely somewhat yellowish, contents strongly to opaque-amyloid, 110–230 (–250) × 20–40 (–50) µm, with numerous locules; locules large, ±rounded to slightly angular, subglobose to cuboidal; transverse septa thin, distinct, regular; ascospore wall and endospore initially thickened, thin to thick at maturity, non-amyloid; wall non-halonate. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), 2’-O-demethylpsoromic acid (major).
  Corticolous in upland and montane rainforest in north-eastern Qld, at altitudes of 530–1200 m; also in Japan.  
  Mangold et al. (2009)  

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

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