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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
Schizotrema zebrinum Mangold

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

T: track from summit to carpark, Mount Warning Natl Park, N.S.W., on bark in temperate rainforest, alt.
800–900 m, 7 Mar. 2005, A.Mangold 19zo; holo: CANB; iso: NSW.

  Thallus almost completely endophloeodal, to c. 100 µm thick, pale grey to greyish green, rarely pale yellowish grey or greenish olive, dull to glossy, smooth to uneven, continuous to verruculose, occasionally rimose. Protocortex discontinuous, to c. 20 µm thick, rarely becoming distinctly conglutinated and forming a true cortex of periclinal hyphae. Algal layer discontinuous and poorly developed; calcium oxalate crystals sparse, small, solitary or in clusters. Vegetative propagules not seen. Ascomata conspicuous, to c. 0.9 mm diam., ±rounded, perithecioid to indistinctly apothecioid in older stages, erumpent, solitary, regenerating, predominantly ±emergent, hemispherical to depressed-urceolate, occasionally rather irregular. Disc usually not visible from above, rarely becoming partly visible, pale greyish to whitish, epruinose. Pores minute to small, to c. 0.2 mm diam., rounded to irregular, 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 thick, apically ±free, ±entirely brown or, usually, carbonised, rarely with a very thin indistinct internal hyaline area, occasionally with substratum inclusions, distinctly amyloid at the base. Inner subhymenial layer dark brown to carbonised, occasionally subtending a hyaline layer of newly developing hymenium. 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 occasionally present in newly developing ascomata (raised subhymenial layer). Epihymenium lacking granules and crystals. Asci 6–8-spored; tholus and lateral ascus walls initially thick, thin at maturity. Ascospores transversely septate, oblong to oblong-ellipsoidal, often slightly bent, with rounded to narrowly rounded ends, hyaline, non-amyloid, 30–80 × 6–11 µm, with 12–22 locules; locules large, ±rounded to slightly angular, oblong to usually ±lentiform; end cells hemispherical to conical; septa thin, mostly regular; ascospore wall thick, becoming distinctly crenate at maturity, with a thin and somewhat irregular halo when immature, non-halonate at maturity.
CHEMISTRY: Thallus K+ yellowish to yellow, C–, P+ reddish or orange; containing constictic acid, conprotocetraric acid, stictic acid, protocetraric acid, fumarprotocetraric acid (all major to absent), hypoconstictic acid, hypostictic acid, virensic acid (all minor to absent).
  Occurs on bark in cool-temperate, warm-temperate and subtropical rainforest in south-eastern Qld, Vic., Tas. and Lord Howe Island, at altitudes of 250–1200 m; endemic.  
  Mangold et al. (2009)  

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

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