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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 desquamans (Müll.Arg.) Hale

Mycotaxon 11: 13 (1980)

Anthracothecium desquamans Müll.Arg., Flora 71: 48 (1888); — Leptotrema desquamans (Müll.Arg.) Patw. & Makhija, Bryologist 83: 368 (1980).

T: Johnstone River, [Innisfail], Qld, Berthoud s.n.; lecto: G, fide P.G.Patwardhan & U.Makhija, loc. cit.

Thelotrema irosinum Vain., Ann. Acad. Sci. Fenn., ser. A, 15(6): 174 (1921); Leptotrema irosinum (Vain.) Zahlbr., Cat. Lich. Univ. 2: 635 (1923). T: Irosin, Luzon, Philippines, A.D.E.Elmer 14749; lecto: TUR-V, fide M.E.Hale, Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 278 (1981).

  Thallus partly endophloeodal to epiphloeodal, to c. 800 µm thick, pale olive to greenish grey, glossy, smooth, continuous to slightly verrucose, non-rimose. True cortex to c. 40 µm thick, consisting of periclinal hyphae. Algal layer well developed, continuous, but interrupted by calcium oxalate crystals, these abundant, small to large, scattered or in clusters. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.4 mm diam., ±rounded, perithecioid, solitary, immersed to slightly emergent, then depressed-hemispherical to hemispherical. Disc not visible from above. Pores minute, to c. 30 µm diam., ±rounded, entire; proper exciple apically visible from above, forming the pore margin, fused, usually whitish-translucent, incurved, flush with the thallus or slightly sunken. Thalline rim margin ±rounded, whitish or brighter than the thallus. Proper exciple fused, ±thin, hyaline internally, yellowish to reddish brown marginally, often ±amyloid at the base. Hymenium to c. 300 µm thick, not inspersed, strongly conglutinated; paraphyses interwoven, sparingly branched, the tips thickened; lateral paraphyses and columellar structures absent. Epihymenium hyaline, without granules. Asci 8-spored; tholus initially thick, thin when mature. Ascospores muriform, usually oblong, rarely subglobose to globose, the ends ±rounded to narrowly rounded, rarely somewhat apiculate, brown, non-amyloid to faintly amyloid, 20–35 × 8–18 µm, with 6–12 × 1–7 locules; locules ±rounded to slightly angular, irregularly subglobose to slightly lentiform; transverse septa thin, regular to irregular; ascospore wall thicker in younger stages, non-halonate; endospore slightly thickened. Pycnidia not seen.
CHEMISTRY: Strain I: Thallus K+ yellowish to brown, C–, P+ orange; containing constictic acid (major), stictic acid (majors), hypoconstictic acid (trace), cryptostictic acid (trace), hypostictic acid (trace). Strain II: Thallus K–, C–, P–; no secondary compounds detectable by TLC.
  Corticolous in lowland to montane rainforest in north-eastern Qld; Palaeotropical.  
  Mangold et al. (2009)  

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

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