Taderick make your own post next time. Otherwise don't use it cuz you NEED to know the proper measurements.

Severed, from my assumptions when the outside of a leaf goes bad it means it's dying off, but when it's in the center it means its getting something bad into its system. Not sure what that color is. Looks like its happening more than just on that set of leaves. It also looks like its outside. If I'm right try to check the acidity of the rain that comes in. If it's inside try to make sure nothing else touches it. Also check for bugs on the bottoms of the leaves where it's hurting. Any help from someone more experience would be appreciated. I'm just putting together the knowledge of plants in general here. Zandor, you wanna have a go at it?

EDIT: http://www.overgrow.com/growfaq/1111

Looks like Ozone Damage.