A fruticose lichen with an erect or pendant thallus that sometimes develops from a crustose base. It can be glossy, or warted and wrinkled, pale yellow-grey to greenish grey, with branches that are brittle and little divided above the base. The pycnidial tips on the branches are pale or concolorous.
Medulla: K- or K+ red, UV- or UV+ blue-white
Ramalina siliquosa is widespread and very common along the Scottish coast where it grows on hard siliceous rocks above the high-water mark, and in exposed sites further inland where there is maritime influence. BLS distribution map
Ramalina siliquosa is distinguished from Ramalina cuspidata by the broader lobes, the absence of a blackened base and the pale or concolorous, rather than black, pycnidial ostioles. It is distinguished from Ramalina subfarinacea by the lack of soredia.
scottishlichens.co.uk 