I found this mushroom growing in a mossy damp area in our local forest walk in Southern Ontario. It has a smooth top with a slight dent in the middle, and pale gills which I think are attached to the stem. Smaller mushrooms nearby seem to be browner in colour, but I'm not sure if they are the same kind. I did a search on the internet.... could it be Russula humidicola? I know nothing about mushrooms, but the picture seemed to fit. Any ideas?