Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
This is true Peltigera canina, a rare species of sandy soils, especially on dunes and in Breckland.
The great majority of records of this species inland in Britain (and quite a lot on dunes too) are errors for the much more common P. membranacea, which is larger and has long, single, "fang-like" rhizines, not the short, tufted ones shown here.
These are good photographs, showing the characters of the underside very well - this should be a standard reference observation for this species.
I have cited this observation as a good example of what should become a "reference observation".
Lat/Lng: 52.335549, 0.579872
OS grid ref: TL758739
growing on the ground amongst grass in an area of sandy heathland in breckland.