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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
Pyxine desudans Kalb

Herzogia 10: 62 (1994)

T: Litchfield Natl Park, c. 100 km S of Darwin, N.T., 13°07’S, 130°45’E, alt. 200 m, in monsoon forest with large sandstone outcrops, 9 Sept. 1992, K. & A.Kalb s.n.; holo: CANB; iso: Herb. Kalb n.v.

  Thallus 2–5 cm wide, adnate to tightly adnate, subdichotomously lobate. Lobes radiating, discrete to contiguous, plane to convex, often slightly concave towards the tips, 0.5–1.0 mm wide, truncate at the apices. Upper surface grey to grey-brown, with patchy pruina at the lobe tips or epruinose; dactyls, isidia and soredia absent. Pseudocyphellae distinct, marginal and laminal, large and patch-like. Medulla orange in the upper layer; lower medulla yellow-orange. Lower surface black in the centre, paler towards the margin; rhizines ±dense, furcate. Apothecia common, cocoes-type, 0.3–0.6 mm wide; disc epruinose. Internal stipe distinct; upper part orange, K+ wine-red, P–; lower part yellow, K–, P–. Ascospores 12–15 × 5.0–5.5 μm. Pycnidia not seen.
CHEMISTRY: Cortex K+ yellow, C–, KC–, P+ yellow, UV–; upper medulla K+ wine-red, C–, P–, lower medulla K–, C–, KC–, P–; containing atranorin (minor), chloroatranorin (minor), unknown terpenes (minor), unknown pigment (trace).
  Endemic on rocks in northern W.A. and in hinterland areas of the N.T. and eastern Qld.  
  Elix (2009l)  

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