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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
Pseudocyphellaria glaucescens (Kremp.) Imshaug
  Adapt. Antarctic Ecosys. 964 (1977); Sticta glaucescens Kremp., Verh. K.K. Zool.-Bot. Ges. Wien 30: 335 (1880). T: Australia, s. loc., coll. unknown; holo: M; iso: MEL.  
  Thallus irregularly spreading, loosely attached centrally, 5–8 (–12) cm wide; margins free. Lobes linear-laciniate, very variable, 1–5 (–8) cm long, 2–8 (–12) mm wide, ±dichotomously to irregularly branched, discrete or contiguous at margins, imbricate centrally, tough, rigid when dry, pliable when wet, rather thin, not coriaceous; apices divergent; lobe margins entire, noticeably thickened, ridged below, without projecting pseudocyphellae. Upper surface glaucous olive to greyish glaucous when dry, olive-green suffused yellowish when wet, faveolate with rounded interconnecting ridges, ±canaliculate towards apices; without isidia, maculae, phyllidia, pseudocyphellae or soredia. Medulla mainly yellow to partly yellow-white. Photobiont green. Lower surface pale yellowish or yellow-white at margins, darkening to mustard-yellow, buff-brown to red-brown centrally, mainly glabrous or with scattered thin white silky tomentum centrally, strongly wrinkled, bullate or puckered. Pseudocyphellae scattered, to 0.2 mm diam.; margins swollen; pore minute; decorticate area yellow. Apothecia marginal, sessile to subpedicellate, 0.5–2 (–2.5) mm diam., deeply cupuliform to ±plane; disc dark red-brown to black, matt, occasionally finely white-pruinose; exciple pale buff or pinkish, corrugate-scabrid, persisting as a coarsely irregularly crenate-stellate structure; epithecium red-brown, K–; hymenium pale straw-yellow or colourless; amphithecium bright yellow; hypothecium opaque, yellow-brown, K–. Ascospores fusiform-ellipsoidal, polarilocular, 22–28 × 8.5–11 µm, brown or olive; septum 2.5–3 µm thick. CHEMISTRY: Pulvinic acid, pulvinic dilactone, calycin, pulvinamide, methyl evernate, tenuiorin, methyl lecanorate, methyl gyrophorate (major), methyl oviate, 2'-O-methyltenuiorin, 2"-O-methyltenuiorin, 2',2"-di-O-methyltenuiorin, evernic acid, gyrophoric acid, stictic acid (major), constictic acid, 9α-acetoxyconstictic acid, norstictic acid, hopane-6α,7β,22-triol (major), 6α-acetoxyhopane-7β,22-diol (minor) and 7β-acetoxyhopane-6α,22-diol (minor).
  A rare Australian endemic growing on twigs and branches of forest trees in eastern New South Wales; also in Lord Howe Is.  
  Galloway et al. (2001)  

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

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