Mammillaria tetrancistra - The Fish Hook Barrel Cactus

Here's one of the plants I bought at the Lyon Arboretum Plant Sale yesterday. The fish hook spines definitely tug on my affinity for fishing, but are also some of the more troublesome spines in the cactus family (in my humble opinion). If you get stuck, it's not a pull back out, singular action resolution. The hook means you have to work the spine out. And the space to do that in is fairly limited (smaller plants). I know because of this plant... Slow growers - but beautiful plants!