Alright, here comes the first question from a total noob. Basically I just want to make sure I don't eat or give to my friends anything I shouldn't.
I got my first growkit and the shrooms grew incredibly fast. I joyfully went to harvest them, although I wasn't happy to see all this white fluffy stuff inside the container. It looks just like what I would get in a tomato, which I would throw out! Is it mycelium or mold?
They are also all over the base of my mushrooms: