Name: Daisy I Reno, Nv (Zone 6b) Not all who wander are lost
Your cactus is Mammillaria spinosissima 'Un Pico'. It may have gotten too cold and too wet but hopefully once inside for the winter it will survive. Keep it warm and go easy on the water. Where ever you had it outside, it wasn't getting enough sun.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost
President: Orchid Society of Northern Nevada
Webmaster: osnnv.org