That's really nice-sized hybrid. It looks like it's got bulbosa or caput genes in it.
Now speaking of hybrids, I got two giant sized caputs not too long ago. This is the size comparison with normal caputs.
I'm guessing that the two giants are the caput medusae 'Sonoran Snow', although I really doubt the one on the right (light green) is. Could be a caput x brachy. What do you guys think or guess it is?