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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 placodizans (Zahlbr.) Wetmore
  Ann. Missouri Bot. Gard. 57: 196 ('1970') [1971]; Heppia placodizans Zahlbr., Bull. Torrey Bot. Club 35: 299 (1908). T: Station II, Tumamoc Hill, Tucson, Arizona, U.S.A., 1908, Blumer; holo: W.  
  Thallus compound, areolate in the centre, effigurate-lobate at the margin; central squamules erect, cylindrical, plane or convex and often sorediate at the top, brownish to olive-green, to 1.3 mm tall, 0.1–0.5 mm thick. Upper cortex absent; epinecral layer 8–15 µm thick, yellowish. Medulla composed of loosely interwoven hyphae with globose to elongate cells, with numerous air spaces; photobiont layer 50–90 µm thick. Lower cortex poorly developed, paraplectenchymatous, 20–40 µm thick, with globose hyphal cells 3–8 µm diam. Apothecia rare, immersed, usually 1 per squamule, restricted to central squamules; disc punctiform, to 0.3 mm diam., yellowish brown to blackish brown; hymenium wine-red in iodine. Asci clavate to obclavate; walls orange in iodine, blue after pretreatment with KOH. Ascospores more than 64 per ascus, globose to ellipsoidal, 4.5–8 × 3–4.5 µm. Pycnidia immersed, simple, globose; conidia fusiform, 3.5 × 1.5 µm.
  Occurs in W.A., N.T., S.A., Qld and N.S.W.; grows on acidic rocks in desert and other arid habitats, frequently in places that receive some shade. Also in South America, south-western North America, Africa and Europe.  
  Büdel (2001)  

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

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