2 Crassula leaves that failed to separate from each other.


What examples of fasciation have you seen on your plants?

Here are a few plants which spontaneously crested on the patio. All of them have reversions going on. On the Pachypodium seedlings the reversions are growing out underneath the main crests.



Here is a crested Echeveria and the normal (original) form to compare.



Tiffany, I think what you're seeing may just be a monstrose plant acting monstrose. Gollums will make some pretty weird looking leaves including fusions, but they're just leaves and end up falling off the plant.

Fasciation means "to fuse", and I think one could say it is the cause of the abnormalities that can lead to cresting and/or monstrose plants. A single leaf can exhibit fasciation, unless the term is being applied incorrectly:

http://ucanr.edu/blogs/blogcor...
http://msue.anr.msu.edu/news/p...

Oh I'm sure you're right, I'm no botanist. Just making a distinction between stem and leaf, the former usually being more permanent in the lifespan of the plant. The leaves that are monstrose to begin with tend to vary more than the normal ones, as if they are a bit unstable form-wise. So you might get fusions or oddities. But Gollum does not revert to jade, at least as far as I can tell. In any case, the type of fasciation that I would call cresting (again, no expert) is fundamentally a change in the stem. And when it happens spontaneously it tends to also be unstable, leading to the outgrowth of normal stems.

Fasciation happens when the apical meristem at the growth tip suddens elongates. There are also apical meristem tissue at leaf nodes (leaves and branches) and root tips but I think that fasciation has to do with the main growth tip. But I could be wrong.

That is how I understand things, with much better vocabulary than I have available. Maybe pile onto your list the additional potential site of fasciation on budding inflorescences.

Here's a fun one... you will note there are 2 types of Semps in this clump: one that's white in the center with red around the outside (most rosettes), and one with red on the inside and white around the outside (lower right). That one is a crest that I have watched grow wider and wider until it made a ring, with active growth around the periphery rather than at the center.

Following Baja's example, here's a crested one I had,

In early summer:


one month later


5 months later