Peltigera hymenina

Thallus 10–20 cm diam., wide-spreading; lobes 1–2 cm broad, overlapping, ± ascending at the apices and margins; margins neither crisped nor with folioles (small regenerative lobules are occasionally present); upper surface glossy to ± matt, occasionally partly glossy, grey or slightly brown, without or rarely with a few slash-like cracks; lower surface with ± well-defined pale to deep ochre veins extending towards the lobe margins, with frequent pale interstices; rhizines pale, slender, simple, unbranched, occasionally splitting towards the ends. Apothecia common, saddle-shaped, to 5 × 3 mm, pale brown or red-brown, ± on short extensions from the margins of the lobes. Ascospores 50–80 × 4–5 µm, 3- to 7-septate, oblong-elongate, acicular.Conidiomata unknown. Thallus with tenuiorin, methyl gyrophorate, ± gyrophoric acid (C± red), T2, ± T3 and ± T4.

A very variable species with lobes ranging from small, very numerous and dissected, to wide, entire and sparse; frequently sterile. The ochre-coloured veins with unbranched pale rhizines are diagnostic. For differences from Peltigera neckeri and P. polydactylon see those species, both have darker and more prominent veins on their undersides. Large and robust thalli with a slightly undulating upper surface, with a distinct network of dark veins and whitish interstices on the lower surface may occur (Clarke 2016).