This was on either alder (most likely) or willow:

[attachment=0]_DSC4255 Cup on willow-alder.jpg[/attachment]
About 1cm tall and with a small cup at the apex. I assume it is a young cup fungus and hence nothing like the mature fungus. Does anyone have any suggestions? No microscopy, though I have a few dried specimens. I have been a bit too busy with more approachable specimens, and haven’t had the enthusiasm to tackle this one.