Pluteus Mushroom

Wow that link did not work, here you go: http://www.biolib.cz/en/image/id8681/

You can count David Arora's "Mushrooms Demystified" book as agreeing with the ID, and it came up relatively fast with the few descriptions I got from your photos! I'm assuming there are few other mushrooms that can be mistaken for the one you've found. :)

I've keyed it out twice and it comes out to Pluteus pellitus, a mushroom that: has pinkish gills in age, occurs on hardwood logs, is often rare, resembles the deadly destroying angels (Amanita ocreata, for example) and is distinguished due to the lack of a ring on the stem and volva sack on the stalk base, occurs in northeast, has a smooth, all-white cap (occassionally there are some with a brown center). It's hard to find more information on it, but that's the best I could manage. Good luck! :)