Michigan's Isonychia Summer

“Commonly referred to as the mahogany dun, this fly officially lives only in a half-dozen places. Yet from the heavily-fished waters of the Au Sable and Manistee to my favorite little secret stream in the western Upper Peninsula, I’ve found a No. 10 mahogany to be a reliable fish catcher starting about the first week in July and often continuing through the first frost in September.” Eric Sharp writes about the under-recognized Isonchia and the often-misidentified green drake in the Detroit Free Press.