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 lordhowensis Mangold | ||
in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 653 (2009) T: Goat House Cave, Lord Howe Island, on Cyanthea in subtropical rainforest, 7 Feb. 1995, J.A.Elix 42259; holo: CANB. |
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| Thallus epiphloeodal, to c. 300 µm thick, usually pale olive-green, or pale yellowish brown, ±glossy, smooth, continuous, non-rimose. True cortex continuous, to c. 50 µm thick, hyaline to slightly yellowish, consisting of periclinal to irregular hyphae. Algal layer continuous and well developed; calcium oxalate crystals sparse. Vegetative propagules not seen. Ascomata conspicuous, to c. 3 mm diam., ±rounded, rarely somewhat irregular, occasionally appearing sparingly branched in fused ascomata, apothecioid to chroodiscoid, erumpent, solitary, rarely fused, usually regenerating, ±emergent, hemispherical to urceolate when immature, depressed-urceolate at maturity. Disc variable, partly to completely visible from above, pale to distinctly flesh-coloured, epruinose to slightly pruinose, in old ascomata the disc often becoming overgrown by an off-white to pale yellowish brown layer. Proper exciple not visible from above; thalline rim margin variable, in young ascomata split to ragged or lobed, ±concolorous with the thallus or brighter, becoming erect to, rarely, recurved; margin developing from the layer covering the disc, splitting and opening irregularly, breaking away in large pieces, marginal parts finally forming the new thalline rim, becoming erect, rarely recurved, layered with age, off-white to pale yellowish brown. Exciple fused, thick, hyaline internally to pale yellowish or yellowish orange marginally, usually extending into a distinct hyaline internal exciple, moderately to strongly amyloid. Hymenium to c. 180 µm thick, moderately conglutinated; paraphyses slightly bent, parallel, the tips not thickened; lateral paraphyses inconspicuous, to c. 25 µm long. Epihymenium hyaline to pale yellowish, with greyish to yellowish brown granules. Asci 1 (–2)-spored; tholus initially thick, not visible at maturity. Ascospores muriform, oblong to ellipsoidal, with rounded to narrowly rounded ends, hyaline, distinctly amyloid, 65–120 × 22–35 µm, with numerous locules; locules ±rounded to angular, mostly irregular, distinctly transversely divided only in younger stages, the septa becoming irregular and disappearing; ascospore wall thin, non-halonate; endospore thin. Pycnidia in raised verrucae, not constricted to strongly constricted or somewhat stalked at the base; apices initially concolorous with the thallus, becoming ±black. Conidia irregularly ±rounded to oblong, to c. 2 × 1 µm. CHEMISTRY: Thallus K+ yellowish to brown, C–, P+ orange; containing stictic acid (major), constictic acid (major), a-acetyloconstictic acid (minor), cryptostictic acid (minor), a-acetylhypoconstictic acid (minor), hypoconstictic acid (trace), hypostictic acid (trace). |
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| Occurs on tree bark in wet forest on Lord Howe Island, south-western Pacific Ocean, and north of Sydney, N.S.W.; collected at altitudes of 380–420 m. | ||
| Mangold et al. (2009) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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