They look like buttholes to me Lloyd.
Second from the right in the back is the Pachypodium lamerei, Madagascar Palm it’s a little rough and recovering hopefully.
This is how it should look before it gets huge (Internet picture)
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We repotted in terracotta recently. (Madagascar Palm is third from the right in the back now)
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Sorry Lloyd when I first posted here I didn’t realize this was about tissue culture. I know nothing about tissue culture, I was likely sloshed.