Peltigera membranacea Membranous Dog-lichen

Peltigera membranaceea is a large foliose lichen which occurs as an epiphyte on trees, on rock and also in grassy places along roads in the uplands. When dry it is rather grey but becomes a dark, brownish colour when wet. The thallus is conspiculously wrinkled (bullate). The undersurface of the thallus is usually white and bears conspicuous, long, pale rhizines. It is the most common species of Peltigera in West Glamorgan and is particularly common in the conifer plantations of the Neath and Afan valleys where it can form spectacular colonies on roadside willows, larch and other trees. Where it occurs in abundance as an epiphyte it is a good indicator of Atlantic or Oceanic, Temperate Rainforest conditions.

Listed by Alan Orange in Flora of Glamorgan (Wade et al, 1994).