Mountain Avens (Dryas octopetala), now in flower, is a rare plant in Yorkshire where it occurs on limestone scars and in short turf near Arncliffe.
According to Wikipedia it is the national flower of Iceland and is therefore presumably tolerant of volcanic ash!
The leaves of this many-branched evergreen have silvery undersides and were thought to resemble oak leaves. Dryad was a wood-nymph in Greek mythology.
Although this plant could host Stigmella pretiosa, I suspect that there would be more chance of finding a first Yorkshire record of this rare leaf-miner on the much commoner Water Avens (Geum rivale).
I saw my first Speckled Wood of the year in the garden today.