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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 tibellii Mangold

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

T: Mt Haig, 22 km NE of Atherton, Atherton Tableland, Qld, 29 Oct. 1983, L.Tibell 15314; holo: UPS.

  Thallus somewhat endophloeodal to epiphloeodal, to c. 400 µm thick, pale yellowish grey to pale greenish grey, glossy, smooth, mainly verrucose to verruculose, usually non-rimose, occasionally coarsely cracked. True cortex to c. 50 µm thick, continuous, consisting of periclinal to irregular hyphae. Algal layer continuous and well developed; calcium oxalate crystals usually abundant, large and clustered. Vegetative propagules not seen. Ascomata conspicuous, to c. 5 mm diam., ±rounded to irregular, occasionally sparingly branched in fused ascomata, chroodiscoid, erumpent, solitary to occasionally fused, immersed to somewhat emergent, occasionally with a ±constricted base. Disc completely visible from above, whitish grey to grey, finely pruinose. Inner proper exciple usually not visible from above, in older ascomata with recurved thalline margins, mostly fused, sometimes becoming slightly detached, whitish; thalline rim margin thick, split to ragged or coarsely lobed, becoming erect to recurved, occasionally eroded in older ascomata, often lightly pruinose internally and ±whitish or brighter than the thallus, the margin concolorous with the thallus. Proper exciple fused to apically slightly free, pale yellowish internally to yellowish brown or dark brown marginally, apically often dark brown and covered with greyish granules, occasionally slightly amyloid at the base. Hymenium to c. 120 µm thick, moderately conglutinated; paraphyses ±straight, parallel, with unthickened to slightly thickened tips; lateral paraphyses conspicuous, to c. 25 µm long; subhymenium conspicuous, dark brown to slightly carbonised. Epihymenium hyaline, with ±coarse greyish granules. Asci 8-spored; tholus initially thick, thin at maturity. Ascospores transversely septate, usually fusiform, with narrowly rounded to acute ends, rarely ellipsoidal, hyaline, strongly amyloid at maturity, 25–45 × 7–10 µm, with 8–12 (–14) locules; locules ±rounded to somewhat angular, mostly lentiform; end cells usually conical; septa thick, often becoming irregular; ascospore wall thick, non-halonate; endospore thick.
CHEMISTRY: Thallus K–, C–, P–; no compounds detectable by TLC.
  An endemic, corticolous species in rainforest and wet-sclerophyll forest in north-eastern Qld, at elevations of 800–1200 m.  
  Mangold et al. (2009)  

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

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