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Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Schizotrema guadeloupense (Hale) Mangold & Lumbsch

in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 657 (2009)

Thelotrema guadeloupense Hale, Phytologia 26: 416 (1973).

T: Parc National de Guadeloupe, Guadeloupe, M.E.Hale 31633; holo: US.

  Thallus endophloeodal to epiphloeodal, to c. 150 µm thick, pale greyish green to pale olive or pale yellowish grey, dull to glossy, smooth, continuous to verrucose, often distinctly rimose. Protocortex continuous or discontinuous, to c. 20 µm thick, this occasionally becoming distinctly conglutinated and forming a true cortex of irregular to periclinal hyphae. Algal layer continuous and well developed; calcium oxalate crystals sparse, small to large, mostly clustered. Vegetative propagules not seen. Ascomata inconspicuous, to c. 0.8 mm diam., ±rounded, perithecioid or apothecioid at maturity, erumpent, solitary or fused, regenerating, predominantly ±emergent, hemispherical to urceolate, occasionally rather irregular. Disc usually not visible from above, rarely becoming partly visible, pale greyish, epruinose. Pores small to rather large, to c. 0.3 (–0.4) mm diam., ±rounded to irregularly angular, formed by the apical margin of the proper exciple; pore margin/visible part of the proper exciple ±split, fused to indistinctly free, off-white to pale brownish, incurved. Proper exciple usually apically free, thick, hyaline internally to brown, dark brown or carbonised marginally, usually with substratum inclusions, distinctly amyloid at the base. Hymenium to c. 200 µm thick; paraphyses straight to slightly bent; lateral paraphyses conspicuous, to c. 30 µm long; true columella absent, but columella-like structures sometimes visible in developing ascomata (raised subhymenial layer) or in fused ascomata; upper subhymenial layer dark brown to carbonised, sometimes subtending a hyaline newly developing hymenium layer. Epihymenium lacking granules and crystals. Asci 4–8-spored; tholus and lateral ascus walls initially thick, becoming thin. Ascospores muriform, mostly ellipsoidal to fusiform, with narrowly rounded to subacute ends, hyaline, non-amyloid, (20–) 30–60 (–70) × 10–25 µm, with 8–20 × 1–8 locules; locules ±rounded to angular; transverse septa thin, distinct, regular; ascospore wall thin, non-halonate; endospore thin.
CHEMISTRY: Strain I: Thallus K+ yellow, C–, P+ orange; containing stictic acid (major), constictic acid (minor to major), a-acetylhypoconstictic acid (trace). Strain II: Thallus K–, C–, P–; containing ‘cinchonarum unknown’ (major) [a dark grey spot after charring, Rf 2/7/3].
  Occurs on tree bark in cool-temperate to warm-temperate rainforest, rarely in montane, subtropical rainforest, at altitudes of 500–1000 m. It is uncommon but widespread in N.S.W. and Tas. Previously known from the Caribbean island of Guadeloupe.  
  Mangold et al. (2009)  

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

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