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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
Peltigera extenuata (Nyl. ex Vain.) Lojka

Lichenoth. Univ. 5: [222] (1886)

Peltigera canina var. extenuata Nyl. ex Vain., Meddel. Soc. Fauna Fl. Fenn. 2: 49 (1878); P. didactyla (With.) J.R.Laundon var. extenuata (Vain.) Goffinet & Hastings, Lichenologist 27: 48 (1995).

T: Asikkala, Tavastia australis, Finland, Kaitas, Silén & Norrlin; lecto: H n.v., fide O.Vitikainen, Acta Bot. Fenn. 152: 38 (1994).

  Thallus ±orbicular to irregularly spreading, thin and fragile, 3–8 (–10) cm wide. Lobes plane to concave, sublinear, often crowded and overlapping, to 4 cm long, 5–15 mm wide, irregularly branched; margins upright to slightly revolute, entire or scalloped, slightly undulate, somewhat thickened, brown, tomentose or not. Upper surface pale brown to greyish brown when dry, smooth, dull, with thick pale flattened tomentum occasionally becoming loose and detached from the cortex, usually glabrous towards the centre, with orbicular mainly laminal soralia 0.3–2.0 mm wide which are bluish grey with brownish margins, sometimes becoming confluent, with or without associated tufts of rhizines; soredia granular, bluish grey. Lower surface pale yellow-buff to greyish, coarsely tomentose. Veins flattened, 0.1–0.3 mm wide, whitish, becoming greyish to brown towards the centre; interstices whitish to pale buff, rounded to elongate-irregular. Rhizines to 5 mm long, white, ±fasciculate and forming dense rows near the margins, becoming darker, somewhat sparser and flocculent towards the centre. Apothecia not seen in Australian specimens; reported as rare, c. 5 mm wide, saddle-shaped; ascospores acicular, 3–multiseptate, 41–60 × 3–4 µm (Goffinet & Hastings, 1995). Pycnidia not seen.
CHEMISTRY: Methyl gyrophorate, ±gyrophoric acid, mostly in sorediate lobes.
  Occurs in Qld, N.S.W., A.C.T., Vic. and Tas.; found on and among mosses on trees, over rocks and soil banks, mostly in moist and/or shaded habitats at rainforest margins or wet forest, or in disturbed environments, at elevations to 1600 m. Predominantly a Northern Hemisphere species (North America, Europe, China and Papua New Guinea; Goffinet et al., 2003).  
  Louwhoff (2009b)  

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

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