I didn't consult Wikipedia. I used what I knew or could find out from books I have here.

Another point of controversy between Rome and the Briton/Celtic churches was the matter of the tonsure. The B/C tonsure was shaving the head from the ears forward and letting the rest grow (a Christian mullet, I guess) and the Roman was to shave the middle of the head and leave a fringe on the sides.

Of such petty things great controversies grow....