The names Wudang Tai Chi Chuan and Practical Tai Chi Chuan International, are interchangable, it is a form of Tai Chi derived from the style originating with the Wu family, this in turn has its origins in Yang family style.
The name Wudang was given by the late, Sifu Cheng Tin Hung and is simply named after the mountain range where the founder of modern Tai Chi, Chang San Feng, lived. There are as many stories about the origins of Tai Chi but what does not seem to be in dispute is that Chang Sen Feng lived in the Wudang mountain range and there is documentary, corroborative evidence that Chang Sen Feng founded Tai Chi Chaun we know today.
Sifu Cheng Tin Hung's Tai Chi Chuan is descended from the lineage of Yang Lu Chan through his second son, Yang Pan Hau.
Wu Chan Yu, a Manchurian, was taught by both these masters. This was the beginning of the Wu family lineage.
Wu Chien Chuan, son of Wu Chan Yu, is recognised as the founder of the Wu style of Tai Chi Chuan. Cheng Win Kwong was a student of Wu Chien Chuan and, in turn, passed his art on to his nephew, Cheng Tin-hung.
Cheng Tin-hung had another teacher, a Buddhist by the name of Qi Min-xuan, who was a very strict master - so strict that he lost many of his students. At one time Cheng Tin Hung was his only remaining student. This master was responsible for Cheng Tin-hung's deepening understanding of the theoretical and fighting aspects of Tai Chi Chuan.