Flammulina velutipes or Velvet Shank to give it its common name is one a handful of fungi that fruit over winter and is easily identifiable.
The cap is a tan-yellow orange that's darker towards the centre. Although there are no photos here, the stalk is yellow at the apex but gets darker towards the base and is very velvety. It lives on decaying deciduous trees.
The first two photos were taken on 24th of February. the second two ten days later and one can see how the mushrooms have matured. These mushrooms are edible but rather flabby in texture and not really worth picking.