Parmeliaceae Usnea subfloridana Growth type fruticose Chemistry: Medulla K+ yellow or orange, P+ instantly yellow to orange-red Widespread on trees (often on twigs), fences and sometimes on rocks. Commonest and most air-pollution tolerant Usnea species. Variable. Erect, bushy thallus with a blackened, transversely cracked holdfast, becoming sub-pendulous with age. Branches +/- papillose with round patches of coarse soredia and insidia. When fertile the apothecia are smaller than those of Usnea florida. Branches are neither constricted, warty nor annulated (with pale rings). Similar: Usnea cornuta, base not blackened

Usnea subfloridana
Canford Cliffs, Dorset. March 2013