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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 subcinerea Stirt.

Trans. & Proc. New Zealand Inst. 30: 397 (1898)

T: Qld, locality unknown, F.M.Bailey 22; holo: BM n.v.

Pyxine meissneri var. sorediosa Müll.Arg., Flora 62: 290 (1879). T: Djur, Seriba Ghattas, Africa, ad saxa Brauneisenstein, 1877, Schweinfurth s.n.; lecto: G n.v., fide R.W.Rogers, Austral. J. Bot. 34: 152 (1986).

Physcia melanenta C.Knight, Trans. Linn. Soc. London, Bot. 2: 48 (1882). T: [neighbourhood of Sydney], N.S.W., ad saxa, 1880, C.Knight s.n.; syn: WELT n.v., M n.v.

Pyxine chrysanthoides Vain., Ann. Acad. Sci. Fenn.,Ser. A, 6(7): 71 (1915). T:Morne Rouge, Antilles, 480–600 m, E.A.Vainio s.n.; lecto: TUR-V n.v., fide T.D.V.Swinscow & H.Krog, Norweg. J. Bot. 22: 65 (1975).

  Thallus 3–8 cm wide, adnate to loosely adnate, subdichotomously lobate. Lobes radiating, contiguous to imbricate, plane but often slightly concave towards the tips, 0.3–1.5 mm wide, subrotund to subtruncate at the apices. Upper surface yellowish grey to grey to brownish grey or olive-grey, pruinose; pruina densely punctiform towards the lobe tips or forming larger plates within the thallus, often glistening; dactyls and isidia absent. Pseudocyphellae distinct at the margins, often spreading laminally, rarely reticulate. Soralia marginal or submarginal and linear, then laminal and punctiform, often coalescing; soredia farinose. Medulla very thin, yellow above, white below. Lower surface black in the centre, paler towards the margin; rhizines ±dense, furcate. Apothecia common, obscurascens-type,
0.3–1.5 mm wide; disc epruinose. Internal stipe indistinct; upper part red-brown, K+ purple, P–; lower part white, K–, P–. Ascospores 13–22 × 6–9 μm. Conidia bacilliform, 3–4 × c. 1 μm.
CHEMISTRY: Cortex K–, UV+ yellow; medulla K+ orange-red or purple, C–, KC–, P– or P+ orange-red; containing lichexanthone (major), triterpenes (major or minor), unknown pigment (minor or trace).
  Occurs on rock, wood and bark in coastal and hinterland forest in south-western W.A., south-eastern Qld and eastern N.S.W. This mainly pantropical species often extends into subtropical and temperate regions.  
  Elix (2009l)  

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

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