Parmeliaceae Punctelia borreri Growth type foliose Chemistry: Cortex: K+ yellow. Medulla and soralia: C+ pinkish-red, P- Occurs on well-lit nutrient-rich trees, sometimes found on coastal rocks. Increasing in range but prefers sunny, mild areas with low rainfall. Blue-grey to greyish slightly notched lobes becoming brownish at tips, the small, punctiform pseudocyphellae becoming +/- sorediate. Lower surface black with simple rhizines not extending to margins. Apothecia are occasional, the discs reddish-brown. Similar: P. subrudecta, pale brownish beneath lobes, medulla C+ red Punctelia reddenda, under-surface black, medulla C-

Punctelia borreri
Canford Cliffs and Sturminster Marshall, Dorset. March 2013 and 2014