I grew this plant from a seed that was supposed to be from P. saxicola. It is definitely not that species, but what is it? Surely a hybrid, and maybe one of the parents is a plant I have long sought - a red-leafed P. bipinnatifidum, or "selloum". What do you think?

Here's another shot of a different leaf emerging.

I have never seen a P.bipinnatifidum with red leaves, or any red in the petioles like that one. Is there possibly some P.xanadu in it?

Keep us updated, that is interesting!

It could be the other way around - that the P. xanadu is a dwarf sport of a plant related to this one . . . The P. xanadu has blood-red spathes but the new leaves are not nearly so red as this one.

Do you have a picture of a mature leaf?
And has this plant ever bloomed?

I always thought that the P.xanadu was a pure species not a sport of a species.
Here is a picture of the original P.xanadu used for the description- http://zachandchristie.com/pla...
My P.xanadu is the tissue cultured one, I thought that it is just the chemicals that made the plant small?

But either way, if you can propagate more of these plants put me on the list.

To me, the P. xanadu has all of the characteristics of a polyploid sport: dwarfism, small and numerous leaves, and very infrequent blooming, if any. The plant can still be a species and yet be a sport of the normal or diploid form of the species. Generally, good TC technique is not going to cause a plant to deform or become dwarf. If it does, the technique used is not good or the tissue being used is too "old". By "old", I mean too many clones have been derived through too many multiplications in vitro, resulting in increased mutations, somaclonal variation and loss of the original morphotype. When that starts happening, a reputable lab will begin a culture anew with fresh tissue from the original mother plant.

Oh, and this plant has not yet bloomed. The mature leaves show very little coloration, but even other philos with bright red new leaves end up with green leaves having just a hint of red. I have hybrids with distinctive red main veins but the emerging leaves are not reddish at all. That observation, plus what you see here, is why I'm sure there is a true red leaved selloum out there. I'm going to try to bring it back out from this plant if I can.

This makes sense, but then where would P.xanadu get the blood red spathe with the chubby spadix?

I am really interested to see what you do with this red leafed plant.
Keep me updated!