They're not uncommon, certainly see them reasonably often and they're referenced in several of my fungi guides. I'll try and post some links in due course. Difficult to be exact from a photo but the habitat is certainly similar.Snowy Meadow Cap? Where does that name come from?...never heard of it before. Haven't heard of Camarophyllus niveus either, but I'm guessing you are referring to Hygrocybe virginea (or Snowy Waxcap). In which it is definitely not, because that species has white gills.