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 | ||
| Pyxine cognata Stirt. | ||
Proc. Roy. Philos. Soc. Glasgow 11: 311 (1879). T: Nilgherries [Nilgiri], India, A.Watt s.n.; holo: BM. Pyxine berteriana var. himalaica D.D.Awasthi, Phytomorphology 30: 366 (1982). T: Almora district, on way to Kasardevi, Uttar Pradesh, India, c. 1930 m, on bark, 12 June 1956, D.D.Awasthi 3476; holo: n.v. |
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| Thallus 2–6 cm wide, adnate to tightly adnate, subdichotomously lobate. Lobes radiating, discrete to ±contiguous, plane to slightly concave, in older thalli becoming slightly convex in the centre, 0.3–1.0 mm wide, subrotund to truncate at the apices. Upper surface white to whitish grey or grey-brown, pruinose in extended patches near the apices, the pruina ±glistening; dactyls, isidia and soredia absent. Pseudocyphellae not prominent, usually retricted to the margins, rarely laminal or becoming subreticulate, often obscured by spreading pruina. Medulla orange in upper part; lower medulla white. Lower surface black in the centre, paler towards the margin; rhizines ±dense, furcate. Apothecia common, obscurascens-type, 0.3–1.0 mm wide; disc epruinose. Internal stipe distinct; upper part orange-red, K+ purple, P–; lower part much paler or white, K–, P–. Ascospores 13–20 × 6–7 μm. Pycnidia not seen. CHEMISTRY: Cortex K–, UV+ yellow; medulla K– or K+ pale red, C–, KC–, P– or P+ orange; containing lichexanthone (major), triterpenes (major or minor), unknown pigment (minor or trace). |
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| Rare on bark in hinterland forest in south-eastern Qld. Also in Asia and South America. | ||
| Elix (2009l) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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