?Hornwort fruit?

[fishyfishy]

Not to long ago, maybe 5 days, I bought a fairly large hornwort about 2 feet in length (I cut it in half). Anyways, one of the halves has eight small oval shaped seed pod things with 3 long spines. I was wondering what these are, and what to do with them. If they are seeds, I think it would be awesome if I could grow them from seed.

 

[HARO]

Ceratophylum demersum does form tiny black seeds, but it is far more easily propagated by simply breaking the stem into sections, which will form their own plants.
John