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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 didactyla (With.) J.R.Laundon

Lichenologist 16: 217 (1984)

Lichen didactylus With., Bot. Arr. Veg. Gr. Brit. 1, 2: 718 (1776), as didactylos.

T: J.J.Dillenius, Hist. Musc. tab. 28, fig. 108 (1742); holo: OXF n.v., fide Laundon (loc. cit.).

Peltigera spuria (Ach.) DC., in J.B.A.P. de M. de Lamarck & A.P. de Candolle, Fl. Franç., 3rd edn, 2: 406 (1805). T: “Svecia” [Sweden]; lecto: H-ACH 1485 n.v., fide O.Vitikainen, Acta Bot. Fenn. 152: 37 (1994).

Peltidea erumpens Taylor, J. Bot. (Hooker) 6: 184 (1847); Peltigera erumpens (Taylor) Elenkin, Acta Horti Petrop. 24: 99 (1904). T: Dunkerron, Kerry, Ireland, 1841, T.Taylor; holo: FH n.v., fide O.Vitikainen, Acta Bot. Fenn. 152: 37 (1994).

Peltigera haszlinszkyi Gyeln. ex Anders, Strauch- und Laubflechten Mitteleur. 44 (1928). T: Europe; n.v.

  Thallus ±orbicular to irregularly spreading, small, 1–4 (–5) cm wide. Lobes crowded, separate or overlapping, plane to mostly concave, cochleate when sterile, 1–2 cm long, 5–10 mm wide, sublinear to irregularly branched; margins mostly erect, entire, slightly undulate, with or without small tomentose apothecial initials. Upper surface grey to tan or dark chestnut to purplish brown, smooth, dull, occasionally covered with pale flattened tomentum, with submarginal soralia 1–3 (–5) mm wide, bluish grey with a brownish margin, initially erupting as small spots, becoming rounded to elongate and eventually confluent; soredia granular, bluish grey. Lower surface pale buff to greyish, coarsely tomentose. Veins flattened to slightly raised, 0.2–0.7 mm wide, tan to darker brown towards the centre, anastomosing, confluent at lobe apices; interstices whitish, rounded to elongate-irregular. Rhizines scattered to dense, 1–4 mm long, pale, simple and slender along margins, becoming brown and ±branched towards the centre. Apothecia erect, rounded to saddle-shaped, 3–4 (–7) mm wide; disc pale to dark red-brown, epruinose; margin thin, crenate, pale buff. Ascospores elongate-fusiform, 3–5-septate, with or without one pointed apex, 42.5–62.5 × 2.5–4.0 µm, hyaline. Pycnidia not seen in Australian specimens.
CHEMISTRY: Typically absent, although methyl gyrophorate and gyrophoric acid rarely present in soralia. Goffinet et al. (2003) considered this chemical variation to reflect phenotypic polymorphism.
  Occurs in all States and Territories, except the N.T. and Qld; grows on soil of road banks, bare earth or peaty soil, on and among mosses, rarely corticolous. Found in Eucalyptus woodland, heathland and disturbed habitats, up to 1550 m altitude. In Tas. often on soil or burnt wood in regenerating logged areas. Cosmopolitan.  
  Louwhoff (2009b)  

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

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