well.. 2 independent ID's ... if its scale.. its treatable.. but i have never seen such on mature bark ... if its mushrooms.. as bboy suggests.. i think.. lol ... they are living on the rotting wood under the bark ... time is limited ... that is a very bad prior pruning.. i am wondering what the prior owner did to the rest of the tree ... two more pix .. as good a closeup as you can get... and a pic of the whole ... may as well tell us where you are also .... ken ps: why am i wondering if this tree was topped.. or telephone poled ... or any significant construction in the root zone... or all three????

Cactus 1 is an opuntia otherwise known as prickly pear! Cactus 2 is a form of cereus but I don't know which! Cactus 3 is another opuntia The 4 pots - not sure on 3 of them but the bottom left is definetely euphorbia enopla. Perhaps a closer up pic of the other 3 as its hard to tell from ur photo :)

Kicking myself for not throwin in the cyphostemma "fat bXstard"(apparently the GW potty mouth police are on the patrol) I'm still drooling over yours Jeff. Don't look at that Mamm. perbella straight on though, it'll give you a headache.

I see the resemblance now. You wouldn't happen to have any clues at to what that great big tall one is, would you? It's my only cactus that remains unnamed. It looks like a really big cutting off of an even bigger old cactus. It looks similar to Trichocereus peruvianus, but those cuttings are very expensive, and I only paid $15. Perhaps, though, the place I bought it from was unaware of what it was. Either way, I think it's definitely a Trichocereus.