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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
Psoroma caliginosum Stirt.
  Proc. Roy. Philos. Soc. Glasgow 10: 295 (1877)
T: near Wellington, N.Z., J.Buchanan 45; lecto: GLAM, fide D.J.Galloway. *****Psoroma dispersum Stirt., Trans. & Proc. Roy. Soc. Victoria 17: 76 (1881). T: Gippsland, Vic., H.Paton; lecto: BM, fide D.J.Galloway & P.M.Jørgensen, Fl. Australia 54: 317 (1992).
  Thallus squamulose, closely attached to substratum, in ±rounded or irregularly spreading patches, 2–10 cm wide, on a fine, black, minutely fibrous prothallus which may extend 2–4 mm beyond squamule margins. Squamules closely appressed, flattened, smooth, lobate-crenate, rounded and scattered at margins, becoming rosette-shaped, 1–2 mm wide, coalescing into a closely attached ±imbricate mosaic centrally, matt or shining, smooth, pale greenish, yellow-green to brownish or pale glaucous, paler at margins; apices and margins slightly thickened, ±whitish pubescent, appearing 'frosted'. Cephalodia lobate-crenate, to 3 mm wide, flattened, placodioid, smooth to striate, ±frequent at margins, laminal or marginal on squamules or growing directly on prothallus, pale blue-grey or blackened to bluish brown, often concolorous with thallus when dry, with a faint blue-black cast. Apothecia sessile, closely attached to squamules or projecting above, ±central, sparse to numerous, round to irregular, 0.2–1 mm wide; margins thick, inrolled, striate-crenate, concolorous with thallus; disc flat, occasionally with small thalline lobules centrally or ±obliterated by concentric rings of thalline tissue, epruinose, matt, dark brown or black. Ascospores 17–24 × 12–14 µm. CHEMISTRY: vicanicin, pannarin, diploicin and leprolomin.
  Known from Vic. and Tas. It occurs widely in N.Z. in lowland areas on trees, shrubs and occasionally rocks in damp, shaded habitats. Known also from South America.  
  Jørgensen & Galloway (1992a)  

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

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