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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
Xanthoparmelia isidiigera (Müll.Arg.) Elix & J.Johnst.
  in J.A.Elix, J.Johnston & P.M.Armstrong, Bull. Brit. Mus. (Nat. Hist.), Bot. 15: 272 (1986); Parmelia conspersa var. laxa f. isidiigera Müll.Arg., Flora 66: 48 (1883); Parmelia isidiigera (Müll.Arg.) Gyeln., Ann. Hist.-Nat. Mus. Natl Hung. 29: 27 (1935), nom. illeg. non Parmelia isidiigera (Müll.Arg.) Vain., Mém. Herb. Boissier 5: 6 (1900). T: King George Sound, W.A., Harris 52; lecto: G; isolecto: US fide M.E.Hale, Smithsonian Contr. Bot. 74: 132 (1990).  
  Thallus foliose, adnate, to 6–10 cm wide. Lobes imbricate or not, irregular, irregularly branched, 1–2 (–5) mm wide; occasionally with narrower laciniae overlying thallus centre; margins entire. Upper surface yellow-green, becoming blackish green in thallus centre, flat to slightly convex, shiny at least near lobe apices, emaculate, smooth, without soredia; lobe margins often black; isidia scattered, short, subglobose, becoming cylindrical, simple or sparingly branched, commonly very slender (0.04–0.08 mm wide); isidia apices syncorticate and intact. Medulla white. Lower surface flat, smooth, shiny, black; rhizines sparse to moderately dense, simple, short, black. Apothecia sessile, to 6 mm wide; disc concave then undulate-distorted, brown to dark brown; thalline exciple thick, involute, becoming undulating and isidiate. Ascospores 7.5–8.5 × 5–6.5 µm. Pycnidia common. Conidia bacilliform to bifusiform, 4–6 × 0.5 µm. CHEMISTRY: cortex K-, UV-; medulla K+ yellow then dark red, C-, KC+ red, P+ orange; containing usnic acid, salazinic acid (major) and consalazinic acid.
  Common and widespread in Australia, occurs in all States and Territories except Tas.; also in Lord Howe Is., Papua New Guinea and on both islands of New Zealand. Grows on rock.  
  Elix (1994z)  

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

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