When we sat down for lunch during a family walk in Piercefield Woods I noticed some rather manky Hart's-tongue Ferns and decided to check them for Psychoides larvae. Almost immediately I noticed a round cluster of sori (the round spore-bearing bits), which I prodded and out popped a brown-headed larva. The brown head indicates the commoner P. filicivora rather than the uncommon P. verhuella. This is quite an easy Micro to spot in midwinter!
This is what the adults look like - distinctive too in their own small way.
Thankyou to the good folk of the Carmarthenshire and Glamorgan Moth Blogs for the heads-up about Psychoides larvae being identifiable.