Department of the Environment and Water Resources home page

About us | Contact us | Publications | What's new

Header imagesHeader imagesHeader images

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 clandestinum (Fée) Hale

Mycotaxon 11: 113 (1980)

Thelotrema clandestinum Fée, Essai Crypt. Écorc., Suppl. 84, 90 (1837).

T: “In America ad corticem Cinchonae lancifoliae Mutis”; lecto: G-Fée 244, fide M.E.Hale, Smithsonian Contr. Bot. 16: 32 (1974).

Thelotrema terebratulum Nyl., Ann. Sci. Nat., Bot., sér. 5, 7: 315 (1867); — Ocellularia terebratula (Nyl.) Müll.Arg., Mém. Soc. Phys. Genève 29(8): 12 (1887); — Myriotrema terebratulum (Nyl.) Hale, Mycotaxon 11: 135 (1980). T: Rio Negro, Nova Granata [Colombia], 1863, A.Lindig 129; lecto: H-NYL 22637, fide M.E.Hale, Smithsonian Contr. Bot. 16: 32 (1974); isolecto: FH-TUCK, G.

Thelotrema clandestinum Fée f. remanens Nyl., Ann. Sci. Nat., Bot., sér. 5, 7: 317 (1867); T. remanens (Nyl.) Müll.Arg., Mém. Soc. Phys. Genève 29(8): 7 (1887). T: Monte del Morro, Nova Granata [Colombia], 1863, A.Lindig 90; holo: H-NYL.

  Thallus endophloeodal to epiphloeodal, to c. 700 µm thick, pale olive-green to yellowish olive, often with paler patches due to the discontinuous algal layer, ±glossy, smooth, continuous to rugose, non-rimose. True cortex usually continuous, slightly yellowish, to c. 50 µm thick, formed by periclinal to somewhat irregular hyphae, rarely partly non-conglutinated and forming a protocortex. Algal layer well developed, continuous, but often partly thinning or patchily absent; calcium oxalate crystals sparse or absent, usually in scattered clusters; medulla distinct. Vegetative propagules not seen. Ascomata usually inconspicuous, to c. 0.3 mm diam., ±rounded, apothecioid, solitary or marginally fused, often clustered, forming dense aggregations, usually immersed, rarely somewhat emergent and hemispherical. Disc often becoming partly visible from above, pale flesh-coloured, epruinose to slightly pruinose. Pores small, occasionally rather broad, to c. 0.1 (–0.2) mm diam., mostly ±rounded to somewhat irregular, entire, rarely slightly split; proper exciple not visible from above. Thalline rim margin usually ±thin, rarely thick, paler than the thallus, forming a narrow pale brownish to off-white ring, level with the thallus to somewhat raised; thalline rim incurved. Proper exciple fused, thin to thick, hyaline internally, pale yellowish to yellowish grey marginally, non-amyloid. Hymenium to c. 90 (–100) µm thick, not inspersed, strongly conglutinated; paraphyses straight to sparingly branched, distinctly septate, slightly interwoven, with faintly to markedly thickened tips; lateral paraphyses and columellar structures absent. Epihymenium hyaline, rarely with fine greyish granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores transversely septate, sometimes with a single longitudinal septum, ellipsoidal to fusiform, mostly with narrowly rounded to subacute ends, hyaline, strongly amyloid, 10–25 (–27) × 6–8 µm, with 3–6 (–7) × 1 (–2) locules; locules ±rounded to somewhat acute, subglobose to lentiform or irregular, with similar or hemispherical to conical end cells; septa thin, sometimes slightly irregular; ascospore wall thick, occasionally with a thin halo; endospore thin to thick. Pycnidia in thalline warts, with brownish pores surrounded by a paler zone. Mature conidia not seen; according to Frisch et al. (2006) bacilliform, to c. 8 × 1.5 µm.
CHEMISTRY: Thallus K+ yellowish, C–, P+ yellow; containing psoromic acid (major), subpsoromic acid (minor to trace).
  Corticolous in rainforest in eastern Qld, at altitudes up to 900 m; pantropical  
  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.

Top | About us | Advanced search | Contact us | Information services | Publications | Site index | What's new