What is my alocasia doing?

Yes I know it's been awhile since I have been on life got in the way of a lot of stuff. But now I am making time for myself!!!

I was water plants this afternoon got to .y alocasia cuprea and saw a bulb at the end of a stem. Not sure what it is ?
Thank you in advance

 

It's setting seed.

 

Should I put a tray under it?

 

You already have something to catch water. If you want to save the seed, when it finishes drying and the seed is fertile you can cut the stem and all off and sew the seeds.

 

Any way to know if it's fertile?

 

Then the bud turns brown the seeds inside should be done cookin' !!