Greetings! Do you still have access to it, or perhaps it has friends that have grown up beside in in the last couple of days? If so, I'd suggest digging down to the bottom of the stem to see if it is encased in a cup-like "volva." cheers, frog
For sure, and best to start a thread for each mushroom photo set. Also opening the thread offers you the option of tagging the thread "Identification." cheers, frog