Daf Yomi - Sukkah 3 - 49 Total or 7 by 7?

Tosfos, according to our version, rules that a sukkah that its length is longer than seven handbreaths, yet its width is less than seven would still be valid. It would seem that a sukkah that has over fortynine square tefachim would be valid. There is a version in Tosfos, brought down on the side of our Gemoros that disagrees with this and holds that a sukkah must have seven tefachim by the length and the width.