I'm not seeing where you get Epiphyllum phyllanthus from Myriam, the leaves don't look the same to me. The 'bumps' on the leaf edges of your first photos are more rounded than elongated. The flowers do match the description you give, I don't know if there are variations or hybrids with the same flowers.
http://reflora.cria.org.br/inc...
http://exoticrainforest.com/Ep...
