A ball embedded in its own pitch-mark in the ground in any closely mown area through the green may be lifted, cleaned and dropped, without penalty, as near as possible to the spot where it lay but not nearer the hole. The ball when dropped must first strike a part of the course through the green. "Closely mown area" means any area of the course, including paths through the rough, cut to fairway height or less.
25-3. Wrong Putting Green
Interference by a wrong putting green occurs when a ball is on the wrong putting green.
Interference to a player’s stance or the area of his intended swing is not, of itself, interference under this Rule.
If a player’s ball lies on a wrong putting green, he must not play the ball as it lies. He must take relief, without penalty, as follows:
The player must lift the ball and drop it within one club-length of and not nearer the hole than the nearest point of relief. The nearest point of relief must not be in a hazard or on a putting green. When dropping the ball within one club-length of the nearest point of relief, the ball must first strike a part of the course at a spot that avoids interference by the wrong putting green and is not in a hazard and not on a putting green. The ball may be cleaned when lifted under this Rule.
PENALTY FOR BREACH OF RULE:
Match play – Loss of hole; Stroke play – Two strokes.
©USGA, used with permission