Physconia perisidiosa

Foliose lichen 3-4 cm wide, with a green thallus when wet, drying grey or grey-brown with tinges of mauve. It has small lobes , expanded towards the tips, with marginal and terminal lip-like soralia and isidiate towards the centre of the thallus. The upper surface is pruinose and the undersides ecorticate at the tips, with black and bottle-brush-like rhizines, and white medulla. Apothecia are rare but when present have pruinose disks and have lobules around the disk margins.