Leslie Tucker made the first picture of N. x xanthochlorus in the wild where I am sure it is this hybrid. He found it in autumn 2013 in Novo Sancti Petri where N. cavanillesii and N. viridiflorus grow together in great numbers. When he saw my pictures of the synthetic xanthochlorus on Daffnet he sent me his photo. With his permission I post it to Daffnet.
Theo
Very nice photo.
Harold