Rhizomarasmius pyrrhocephalus (Hairy Long-stem Marasmius), synonyms Marasmius pyrrhocephalus, M.longipes, M.elongatipes

Photo above was taken at Mauthe Lake Recreation Area
Photo was taken at New Observatory Woods State Natural Area
Both photos (above & below) were taken at Browntown Oak Forest State Natural Area
Photo was taken at Phil's Woods County park, Dane County