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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 microspora Vain.

Philipp. J. Sci., sect. C, 8: 110 (1913)

T: prope Cabayan, Benguet Province, Luzon, Philippines, R.C.McGregor; holo: TUR-V 8804 n.v.; iso: BM n.v.

  Thallus 1–4 cm wide, tightly adnate, subdichotomously lobate. Lobes radiating, discrete to ±contiguous, plane to slightly concave, 0.2–0.5 mm wide, subrotund to truncate at the apices. Upper surface white to pale grey, greenish grey, yellowish grey or brownish grey, sparsely pruinose at the lobe tips or epruinose; dactyls, soredia and isidia absent. Pseudocyphellae ±distinct, marginal and sometimes laminal, irregular or very rarely becoming reticulate. Medulla uniformly white. Lower surface black in the centre, paler towards the margin; rhizines dense, short, ±furcate. Apothecia obscurascens-type, 0.3–0.8 mm wide; disc epruinose. Internal stipe indistinct, short, white to brown, K–, P–. Ascospores 10–16 × 4.5–8.0 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).
  Occurs on rock in coastal and hinterland forest in northern N.T. and eastern Qld. Also in Asia, Africa, South America and the central Pacific island of Onotoa (Kiribati).  
  Elix (2009l)  

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

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