Pertusariaceae Pertusaria multipuncta Growth type crustose Chemical results: K+ yellow, C-, KC+ yellow, P+ orangish, UV- or glaucous Most frequent on trees with smooth, acidic bark in old, undisturbed woodland, especially on twigs and young branches. An NIEC 'Old woodland' indicator species. Variable. Smooth whitish-grey thallus or thick, warted and +/- cracked. Scattered white, clearly delimited sorediate warts, 1-5 brown apothecia within each wart. The asci are 1-spored. Similar: Phlyctis agelaea. Pertusaria albescens and Pertusaria amara are usually sterile.

Pertusaria multipuncta
Wessex Lichen Group meeting, New Forest, Hants. December 2012