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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
Myriotrema trypaneoides (Nyl.) Hale

Mycotaxon 11: 135 (1980)

Thelotrema trypaneoides Nyl., Ann. Sci. Nat., Bot., sér. 4, 19: 335 (1863); — Leptotrema trypaneoides (Nyl.) Riddle, Bull. Torrey Bot. Club 43: 151 (1916).

T: Cuba, C.Wright, Lich. Cub. 156; lecto: FH-TUCK, fide M.E.Hale, Smithsonian Contr. Bot. 38: 54 (1978); isolecto: US.

  Thallus endophloeodal to epiphloeodal, to c. 1 mm thick, sometimes bulging and splitting from the substratum, pale to medium greenish grey, often with a grainy-speckled surface pattern, ±glossy, smooth, continuous to verruculose, usually non-rimose. True cortex continuous, to c. 40 µm thick, hyaline, largely consisting of periclinal hyphae. Algal layer continuous, well developed; calcium oxalate crystals usually abundant, small to large, clustered, often forming columns. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.5 mm diam., ±rounded, perithecioid, solitary, immersed to slightly emergent and hemispherical. Disc not visible from above. Pores to c. 0.05 mm diam., ±rounded, entire; apex of the proper exciple becoming visible from above, forming a fused inner pore margin; pore margin level with the thallus, often sunken, incurved, bright-translucent to grey. Thalline rim margin thick, ±rounded, entire, concolorous with the thallus; thalline rim not conspicuous from above, incurved in emergent ascomata. Proper exciple fused, thin, pale yellowish internally, yellowish to orange-brown marginally, occasionally dark brown apically, non-amyloid. Hymenium to c. 250 µm thick, densely inspersed, moderately conglutinated; paraphyses thin, straight to slightly bent, parallel, unbranched, the tips unthickened to slightly thickened; lateral paraphyses and columellar structures absent. Epihymenium hyaline to yellowish, or orange towards the proper exciple, without granules and crystals. Asci 8-spored; tholus initially thick, thin when mature. Ascospores muriform, oblong to ellipsoidal, with ±rounded to narrowly rounded ends, brown (even when immature), non-amyloid, 25–40 × 8–15 µm, with 6–12 × 1–6 locules; locules initially large, becoming smaller at late maturity, ±rounded to slightly angular, subglobose to oblong or irregular; transverse septa thin, ±regular; ascospore wall and endospore initially thick, often thinner at maturity; wall non-halonate. Pycnidia not seen.
CHEMISTRY: Thallus K+ yellow, C–, P+ orange; containing constictic acid (major), stictic acid (major), cryptostictic acid (minor), hypoconstictic acid (minor), hypostictic acid (minor).
  Corticolous in rainforest in eastern Qld, from sea level to 700 m; pantropical..  
  Mangold et al. (2009)  

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

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