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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
Chapsa minor (Kantvilas & Vězda) Mangold & Lumbsch

in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 654 (2009)

Chroodiscus minor Kantvilas & Vězda, Lichenologist 32: 341 (2000).

T: Weindorfers Forest, Tas., alt. 1000 m, on Nothofagus cunninghamii in rainforest, 9 Feb. 1988, G.Kantvilas 16/88; holo: HO; iso: Herb. Vězda n.v.

  Thallus endophloeodal to endophloeodal, to c. 80 µm thick, greyish green, dull to slightly glossy, smooth, continuous, non-rimose to slightly cracked. Protocortex continuous or discontinuous, to c. 10 µm thick, occasionally becoming distinctly conglutinated and forming a discontinuous true cortex of periclinal hyphae. Algal layer discontinuous and poorly developed; calcium oxalate crystals absent. Vegetative propagules not seen. Ascomata conspicuous, to c. 1 mm diam., ±rounded to slightly irregular, apothecioid to chroodiscoid, initially erumpent, becoming sessile, solitary, rarely slightly fused, becoming emergent, depressed-urceolate to cupular. Disc partly to rarely completely visible from above, pale flesh-coloured, epruinose. Proper exciple not visible from above; thalline rim margin radially split, ragged and lobed, becoming distinctly layered, off-white, usually incurved, only the outer layers becoming erect to recurved. Exciple fused, hyaline internally to yellowish brown marginally, amyloid at the base. Hymenium to c. 80 µm thick, strongly conglutinated; paraphyses slightly bent, parallel to slightly interwoven, the tips not thickened to slightly thickened; lateral paraphyses inconspicuous, to c. 20 µm long. Epihymenium hyaline to pale yellowish, without granules, often with small crystals. Asci 8-spored; tholus thick, not visible at maturity. Ascospores transversely septate, ellipsoidal to more commonly fusiform or clavate, with narrowly rounded to usually subacute ends, hyaline, non-amyloid to faintly amyloid, 20–28 × 4–6 µm, with 6–9 locules; locules ±rounded to angular, subglobose to rectangular or irregular; end cells hemispherical to conical; septa thick, regular; ascospore wall thin, with a thin halo when immature; endospore thin to slightly thickened.
CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing stictic acid (major to minor), hypostictic acid (major to minor), constictic acid (minor to trace), cryptostictic acid (trace).
  Rare and endemic on tree bark in cool-temperate rainforest in Vic. and Tas., at altitudes of 300–1000 m.  
  Mangold et al. (2009)  

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

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