Thanks Suze and Patrina. Well, I guess I spoke too soon declaring Stump of the World immune. This is some nasty stuff. In just two days the plant looks like hell. One of two main stems is brown and the leaves are going down fast. It didn't have a spot on it 2 days ago.
On SotW the leaves actually do wilt and they don't get as crispy as the rugose leaves. I'm going to pull it to try and save the Gary O'Sena next to it. They haven't had leaf to leaf contact yet as far as I can tell.
The beginning of the end.
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Leaf wilt.
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Not crisp but dried out. Almost like leather.
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