To find the parents, you won't. This is a species Phrag. Was know as
Phrag. caudatum var Wallisii but if you refer to the Taxonomy section you will find a discussion Phrag warscewiczianum, reference is made to this Phrag wallisii,. It is now known as Phrag. popowii.
Dr. Guido Braem has written at length why this is so.
Roy