It's a nice flower but dosn't look like P. insigne sanderae should look like. The brownish spots on the dorsal are o.k. but the brownish veines on the petals and the brownish colour not only hint on pouch - sorry but thes shouldn't be there.
In my eyes this sibling cross is just a P. insigne, nothing more.
what is it's measures?
Very cool color form!
Great to see some different color forms coming back in the mix with this species, old literature mentions hundreds of different color forms back in the golden age of this species discovery and cultivation.
Guldal
The probability of albas all depends on where the mutations are that cause this change. If both parents have the mutation in exactly the same place in the chromosome then you will probably get 100% albas in the following generation.
If the albas are caused by two separate mutations in different places then you can get all sorts of things depending on how they interact at a genetic level.
Each alba mutation could be compensated and counteracted by the wild type in the progeny and therefore you get non alba progeny.
David
That means in reverse conclusion, at least in my eyes, nurseries o sellers in general shouldn't sell progenies of such crosses not before they'd flowered for the first time, to avoid mislabeling and disappointment with the costumers.
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