Block on Try / FG

[ljudge]

I forget where I read this rule and worse forget exactly what it said. I had my first scrimmage today and the teams practiced PAT's / FG's. A kid was hitting the block with this foot and the coach asked if he could kick without a block. I told him I was certain a tee/block was required and would find out. The coach knows me and knows I know the rules pretty well but I had to be honest and said I wasn't 100% sure. I have read this rule a few times in the past and forget exactly where it is. Can anyone cite the rule reference on whether a block is required?

I thought it said something like the ball must be controlled on a kicking tee which would make the play illegal. Or, it could have said "controlled on the ground or a kicking tee." I thought it was the former and told the coach I would find out for him.

I flat out forget this rule and couldn't find it in the rule book after the scrimmage.