I have been growing Christmas cactuses since 1961, and I have never seen anything like this before. Has anyone else seen it? Any ideas what's the plant is doing?
Here's a picture of the mysterious growth. (The remains of the flower are still attached, although all of the others have fallen off.)
Here's a picture of the same plant, or another from the same original stock, taken last November.
(Each picture is about 1.3 MB.)