Have you asked Banta? I am going to see if I still have an email address for John and will copy him here.
I remember seeing a collection at Jim Bloom’s place years ago that I labeled Philodendron cf. pluto but I cannot now find an image
From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of John Criswick
Sent: Thursday, October 02, 2014 5:26 PM
To: 'Discussion of aroids'
Subject: Re: [Aroid-l] Philodendron hybrid
Thanks for your response to my post.
Well having grown Pluto in the 70s and 80s I would say definitely not, despite similarity of leaf shape. I seem to remember Pluto as being of a burgundy hue, also.
I know nothing of the parentage of Bob See’s hybrid. I wonder if there is someone who does?
John Banta, perhaps?
Dear John: Was this what was known commercially as Philodendron “pluto”?
We were recently discussing those plantsmen who have contributed to the richness of our plant scene today, and I mentioned Bob See of South Florida.
Here are photos of the hybrid philodendron he created.
It is very slowly vining. This specimen was grown in shade but in sun it could vine even more slowly and be more chunky.