Several healthy patches found on the trunk of a mature Norway Maple tree.
No interactions present.
Does it grow on specific trees or in particular areas?
I've never seen it growing before.
I think it can be found on a variety of trees and certainly in the park here it can be found on several different species, and it appears widespread through the UK and Ireland (http://data.nbn.org.uk/imt/?mode=SPECIES&species=NHMSYS0000309902)
I would suggest checking trees in you local park, it is relatively small, tends to be appressed to the bark and brownish green so easily missed so it helps to spend a bit of time searching a particular tree.
It might also help to pick trees that have quite a few other species such as Orthotrichum species.
'The Guide' states for habitat "A very common liverwort on trees and shrubs in most of Britain. It grows on a variety of trees, especially ash. Willow. poplar etc., in well-lit surroundings, but can also occur on rock and in turf, especially in coastal areas.
The guide pdf for this species is freely available here: http://www.bbsfieldguide.org.uk/sites/default/files/pdfs/liverworts/Frul...
Thanks to the British Bryological Society.
Thanks for the info about it, very helpful.
Lat/Lng: 53.4050088, -2.8761438
OS grid ref: SJ418901
Slightly rough bark of a mature tree.