Ilya,
> does this mean that seedlings that you showed were from monoembryonic seeds with white cotyledons?
No, not at all. The seedlings I grow all come from one seed, the only one I had in many years. I Think the cotyledons were green but the main thing is that the seed looked like a "normal" citrus seed, like a lemon seed. The ones of this year are very different. They are big and puffy and we can see the green cotyledons through the testa. It makes bumps on the seeds making me think they are polyembryonic but I still didn't open one. They exactly look like yuko seeds that are very polyembryonic.
The 'work' of these days is to eat the fruits and collect the seeds. Later I shall take pictures.
Snek,
> Hybrid (Unshiu x P. ITSZ Prague“ is the greatest mystery among citruses for me.
It will remain like this as long as you shall consider Prague chimera like a(n) Hybrid.
When you will think of a chimera, everything will become clear and even evident.
> I've seen some of it in very old photos (50's or 60's). And it looked very convincing. E.g. orange, sometimes with trifoliate leaves.
If you know an equivalent chimera with orange please immediately take cuttings ( and send me some ;-) ).
> When cutting the screws, the second genome remained on the original plant. Is it even possible? If so, could it happen to the hybrid (Unshiu X P.T.) ITSZ Praha? If it's a chimera.
I am not sure to understand this sentence but if you mean "is it possible to obtain a pure mandarine fruit from a(n) hybrid of poncirus", the answer is absolutely 'NO' for an hybrid and absolutely 'YES' for a chimera!
It is the same for a pure trifoliate branch, the answer is absolutely 'NO' for an hybrid and absolutely 'YES' for a chimera!
It is the same for monofoliate polyembryonic seedlings and for everything we can see on the prague. It is always NO for a hybrid and always YES for a chimera.