Nice collection you have listed there Mark! My cacti survives quite well our wet winters, except with this one that really hates cold and wet..the others survive well as long as they get very good drainage. I do not know what this one is called..but so far I have not given up on it..too bad I have to chop and chop a big part now
So if you come across it, make sure to provide this one with shelter for the cold and rain.
I used to fondly call it my mickey mouse cacti...just because the new growth looks like ears, as it slowly got a rotten base, hence falling down.
Chopped and chopped..and now it is very short...doing a smaller pot in a bigger pot, so I can pull it when the rainy winter comes later on..otherwise I may have nothing left already:
Do post pictures! Always nice to see photos!!