Kyle, I haven't a clue where I got the seeds from. I have had seeds from Phil before and also buy a lot from ebay and some from Jim Johnson too!
I have always wanted the Nagensium with the black midribs but so far it has eluded me.
I did try a neagensium last year outside with no protection and it never came back...But...Cheesmanii did
It was cut to the ground and then a small shoot came up late spring. Its not going to make a nice speciemin though.