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I agree that your JG x Langshan cross would be a mixed breed. And maybe I'm misunderstanding what they did with these birds. But the brief paragraph they have in my book led me to believe that Gelder ended up with two types of the same bird from the same crossing (one with muffs and beard and one without). I'll quote the book word for word: "Van Gelder crossed Bearded d/Anvers with feather-legged bantams in an attempt to get a booted bird with low posture, a compact and asymmetrical body, a full beard, and a single comb. Today the APA and ABA recognize the two as separate but closely related breeds. They have the same description in all ways except that the d'Uccle has a full beard and muffs and the Booted doesn't." This book recognizes over 100 breeds of birds with color photos, each breed getting a separate write up. But they even combine the D'uccle and Booted in the book, they share the same description. Like I said, I could just be misunderstanding the way the breeds came about. Either way, they're both great birds.
Further research shows that nobody really knows for sure about these birds. There are conflicting stories, some people think they came from the same breeding and some people don't believe they even came from the same person. Here's what Wiki says:
The Booted Bantam is closely related to the Belgian Bearded d'Uccle. The most significant differences in conformation between the two are the d'Uccle's feather beard and the greater height of the Booted.[2] Some sources assert the two breeds share a singular point of origin, with a Belgian breeder around the beginning of the 20th century.[3] Other sources point to a clearly documented presence in the Netherlands since the 16th century,[4] and note that the Booted Bantam is known to this day in the Netherlands, as the Nederlandse Sabelpootkriel (Dutch, Dutch saber-legged bantam).[2] Whatever their exact relation, Booted Bantams and Bearded d'Uccles are only two of a handful of chicken breeds to possess vulture hocks, (Sultans do too).
So there - now it's clear as mud for me!