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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
Peltula impressa (Vain.) Swinscow & Krog
  Norweg. J. Bot. 26: 219 (1979); Heppia impressa Vain., Beibl. Hedwigia 37: 43 (1898). T: "Africa centr. Ruwenzori exped.: in rupe gneissacea 1300 ped. S. m. in viciniis montis Ruwenzori", Scott Elliot 14; holo: TUR-VAINIO 12492.  
  Thallus compound; central squamules obconical to clavate or cylindrical, convex or flattened apically, 0.4–0.8 mm long, 0.2–0.5 mm wide, olive-brown, smooth; marginal squamules effigurate, orbicular or sometimes almost ribbon-like. Upper cortex absent; epinecral layer 6–12 µm thick, yellowish. Medulla comprising densely interwoven hyphae with globose to elongated cells, 2.5–3 µm thick, with a poorly defined photobiont layer in the upper part. Lower cortex paraplectenchymatous, 15–24 µm thick, with globose hyphal cells 5–8 µm diam. Apothecia immersed in central squamules, 1 or 2 (or 3) per squamule; disc 0.1–0.3 mm diam., red-brown to black. Asci clavate to obclavate; ascus wall red-brown in iodine, blue after pretreatment with KOH. Ascospores more than 64 per ascus, globose to ellipsoidal, 3.5–5 (–7) × 2.4–3.5 (–4) µm. Pycnidia globose, very rare; conidia not known.
  Occurs in northern W.A., N.T. and Qld; grows mainly on acidic rocks in grassland, desert and in other open arid habitats. Also in Brazil, Mexico, south-western U.S.A., Africa and Hong Kong.  
  Büdel (2001)  

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

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