PEHRSON, Edna Mary (Black) Of Lexington, Aug. 9, 2014. Wife of Clifford K. Pehrson. Mother of Anne M. Pehrson of Lexington, David A. Pehrson of FL, Mark J. Pehrson of Andover, and the late Clifford K. Pehrson Jr. Edna is also survived by 3 grandchildren, Jennifer, Matthew, and Jillene. A Memorial Mass will be held Wednesday, Aug. 20 at St. Brigid Church, 2001 Mass. Ave., Lexington at 10am. Relatives and friends are kindly invited to attend. In lieu of flowers, donations in her memory may be made to the American Heart Association , PO Box 417005, Boston MA 02241-7005. Private interment Westview Cemetery, Lexington.