(Marion County, OR)  --  A search is slated to resume later this morning for a Portland man who got lost on a hike in the Jefferson Wilderness area in Marion County.  Authorities say 21-year-old Ryan Zickel had planned to stay only Wednesday night on the hiking trip, but he hasn't been seen since.  Crews from Linn County, Polk County, the US Forest Service, and the Air National Guard are assisting Marion County crews in the search.