I had such a pattern on 'Mahogany Muse' during it's maiden bloom. It was still beautiful the next year, but the cross checks/marks were gone.
Zone 6 KY
From: AIS Janet Smith firstname.lastname@example.org [iris-photos] <email@example.com>
To: Iris-Photos <firstname.lastname@example.org>
Sent: Sat, Aug 2, 2014 9:49 am
Subject: Re: [iris-photos] Checkerboard Pattern Soft Brown and White----Iris????
Betty that makes sense. Dr. Weiler did have beds of seedling beds around some of the walkways at the University.
Thank you so much.