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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
Hypotrachyna imbricatula (Zahlbr.) Hale
  Smithsonian Contr. Bot. 25: 41 (1975); Parmelia imbricatula Zahlbr., Denkschr. Kaiserl. Akad. Wiss., Math.-Naturwiss. Kl. 83: 168 (1909). T: Itapecirica, São Paulo, Brazil, V.Schiffner s.n.; lecto: W; isolecto: MICH, fide M.E.Hale, loc. cit.  
  Thallus adnate, to 5–10 cm wide. Lobes often crowded, sublinear, subdichotomously branched, 2–4 mm wide; margins entire; apices incised. Upper surface whitish grey but often turning pale tan in herbarium, flat, shiny, usually strongly white-maculate, without soredia and pustules; isidia moderately dense to dense, cylindrical, simple to branched, slender, rarely becoming partly lobulate or procumbent, sometimes darkening at apices. Medulla white. Lower surface densely rhizinate; rhizines densely dichotomously branched. Apothecia not seen. [According to Hale (1975) apothecia are infrequent, 2–10 mm wide. Ascospores 11–16 × 7–10 µm.] Pycnidia not seen. CHEMISTRY: cortex K+ yellow, UV-; medulla K-, C-, KC+ yellow-orange, P-; containing atranorin, chloroatranorin, barbatic acid (major), obtusatic acid (submajor/minor), 4-O-demethylbarbatic acid (minor) and norobtusatic acid (trace).
  Scattered in coastal and hinterland forests of eastern Australia (Qld and N.S.W.); a widely distributed subtropical–tropical species also known from the Americas and SE Asia, Papua New Guinea and Hawaii. Grows on bark, rock and, rarely, on soil.  
  Elix (1994h)  

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

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