Trentepohlia?

Trentepohlia?

Observation - Trentepohlia? - UK and Ireland. Description: On birch in a very wet part of the woods, mostly sphagnum surrounding the trees. Rather dark rusty colour, in contrast to the much brighter orange Trentepohlia elsewhere. Are they likely to be dif

On birch in a very wet part of the woods, mostly sphagnum surrounding the trees. Rather dark rusty colour, in contrast to the much brighter orange Trentepohlia elsewhere. Are they likely to be different species, and if so how do you tell them apart?