Parmeliaceae Parmotrema reticulatum Growth type foliose. Identification: Bryan Edwards, Vince Giavarini Chemical results: Cortex K+ yellow. Medulla K+ yellow > orange, C-, KC+/- red, P+ orange-red, UV- Can be common in southern England on well-lit wayside and woodland trees, occasional on coastal rocks. Grey-green lobes with marginal cilia, upper surface +/- covered with fine network of white hairline cracks. Lower surface dark brown to black, rhizines extending to margins. Soralia with granular soredia on lobe tips and margins. Variable. Similar: P. pseudoreticulatum. Marginal zone of lobes without rhizines P. perlatum. Lobes without cracks. KC+ yellow-orange, P+ yellow-orange

Parmotrema reticulatum
Holton Lee, Dorset. March 2013