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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 physciaeformis (Malme) Imshaug

Trans. Amer. Microscop. Soc. 76: 257 (1957)

Pyxine meissneri var. physciaeformis Malme, Bih. Kongl. Svenska Vetensk.-Akad. Handl. 23(3): 36 (1897).

T: Corumbá, Mato Grosso, Brazil, in silva minus densa, in declivibus collis, 10 Aug. 1894, G.O.Malme 3880; lecto: S n.v., fide K.Kalb, Biblioth. Lichenol. 24: 61 (1987); isolecto: UPS n.v.

Pyxine cocoes var. caesiopruinosa Nyl., Syn. Meth. Lich. 2: 2 (1863); Pyxine caesiopruinosa (Nyl.) Imshaug, Trans. Amer. Microscop. Soc. 76: 262 (1957). T: Carolina and Georgia, U.S.A., H.W.Ravenel s.n.; holo: H-NYL 31760 n.v.; iso: UPS n.v.

  Thallus 2–5 cm wide, adnate to loosely adnate, subdichotomously lobate. Lobes radiating, contiguous to imbricate, plane but often slightly concave towards the tips, 0.4–1.0 mm wide, subrotund at the apices. Upper surface ivory-coloured to grey or blue-grey, pruinose; pruina punctiform towards the lobe tips, or forming larger plates within the thallus, matt or glossy; isidia absent. Pseudocyphellae rarely well developed, marginal or laminal, often slightly ridged. Dactyls laminal and marginal, scattered or clustered, nodular to subcylindrical, short, ±branched, pustulate, bursting apically to produce granular soredia. Medulla yellow to yellow-orange in the upper part, white below. Lower surface black in the centre, paler towards the margin; rhizines ±dense, furcate. Apothecia common, physciaeformis-type, 0.5–2.5 mm wide; disc grey-pruinose when immature. Internal stipe distinct, white, K–, P–. Ascospores 13–19 × 5–7 μm. Pycnidia not seen.
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).
  Very rare on bark in coastal woodland in south-eastern N.S.W. Also in Africa and South America.  
  Elix (2009l)  

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

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