I found a small fertile thallus of Enterographa crassa on a thin Hazel branch in a Dorset woodland and what appears to be a smaller, infertile bit on a Hawthorn twig.
But a similar thick bluish-grey thallus further along the Hazel branch had punctiform white soredia - which isn't mentioned in the LGB&I3 Enterographa crassa account?
All three gave a K/UV blue reaction, though it was more bluish-mauve with the Hawthorn specimen.
Enterographa crassa (fertile)
Enterographa crassa on Hawthorn
Thallus with puctiform soredia