Pale bristle-moss Orthotrichum pallens
A rare (in the UK) green moss.
Pale bristle-moss is small, loosely tufted epiphyte - a plant that grows on another - or some other object such as a wall - but not as a parasite.
This moss is restricted to just nine sites, eight in Weardale, Co. Durham and one in North Yorkshire.
The bark of trees with base-rich bark such as elm, elder and sycamore.