| hmmm nice pics oh sorry back to your question.
That little knob is most likly a Kiki. ( a baby ) I have also seen flower spikes start like that as well.
I think when that gets a little bigger you will have a better idea as to what it is.
If its a kiki it will grow for you and through new shoots.
Dens produce new growths in two ways they form kiki,s and new groath down at the base of the plant as shown in your pic.
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