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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
Lepraria membranacea (Dicks.) Lettau

Feddes Repert. Spec. Nov. Regni Veg. 61: 127 (1958)

Lichen membranaceus Dicks., Fasc. Pl. Crypt. Brit. 2: 21, tab. 6, fig. 1 (1790); — Leproloma membranaceum (Dicks.) Vain., Természetrajzi. Füz. 22: 293 (1899).

T: Scotland, on humus over mountain rocks, J.Dickson; holo: BM.

  Thalluscrustose to squamulose, pale yellow-grey to yellow-white, determinate, consisting of powdery lobes, forming irregular rosettes to 3 cm wide, often becoming contiguous or confluent with other thalli, the surface covered by a loose mass of convex granules or soredia, disintegrating or eroding with age to form a leprose mass. Margin with well-developed lobes to 2 mm long and wide, with an entire ±plane or usually distinctly raised rim, broadening towards the rounded tips. Soredia fine to coarse, usually ±globose, 40–70 μm wide, often aggregated in consoredia 125–200 (–500) μm wide, with or without short projecting hyphae. Medulla distinct, white. Hyphae 2–5 μm thick. Photobiont cells ±spherical, 7–15 μm diam. Lower surface a distinct hypothallus, grey-white to brown or greyish black, sometimes white along the thallus margin, forming a ±thick tomentum, occasionally extending well beyond the thallus margin.
CHEMISTRY: Thallus K– or K+ yellow, C–, KC–, P– or P+ orange, UV+ purple-blue; pannaric acid (major), roccellic acid (major), atranorin (minor).
  Rare in Tas. where it grows on the bases of trees and shrubs in rainforest; also known from North and South America, Europe and Africa.  
  Elix (2009i)  

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

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