I just purchased this plant at the Santa Barbara show (for $40 - overpay?) from ecuagenera, and was confused when I got home and realized longifolium x caudatum = Grande. I actually passed up on a Grande they were selling because I thought it would be too much like my Giganteum. Found this thread which clarifies the (supposed) difference.
I thought folks looking at this thread might be interested in the insight of Colombian Phrag expert Eliseo Teson, who tried to explain the parentage of my Giganteum to me:
Quote:
Grande x caudatum (the peruvian form), where Grande is popowii (humboldtii) x longifolium so it is 50% caudatum, 25% popowii and 25% longifolium.
Inside this complex you can find three "species"
1-Phrag. caudatum: The one from Perú.
2-Phrag. warszewiczianum: from Ecuador and Colombia + (Venezuela?). Also know as wallisii but the correct name is warszewiczianum.
3-Phrag popowii or humboldtii (from Central America). there is a great confusion with this one because some people called it in the past warzcewiczianum and now some people call it popowii and others humboldtii. (I do agree with Guido Braem and i call it popowii but this could lead to a big problem with the nomenclature).
The Phragmipedium lindenii is a mutant warszewiczianum, (a monster) but it was described earlier so if we follow the taxonomic code warszewiczianum should be treated as a synonym and we should call this entity Phrag lindenii (can you imagine?).
The Phrag popowii also has mutant entities that was described as exstaminodium, triandrum and monstruosum and all the descriptions predate the name popowii so again we should call this entity exstaminodium... again a big problem...
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According to this, Olaf Gruss may well be right if there is a reasonable possibility that the plant in Central America and the plant in Peru are separate species, which certainly seems likely!