1. CNR‐ Istituto di Biologia Agroambientale e Forestale, Via Salaria Km. 29.300 00016 Monterotondo Scalo (Roma), Italy;
2. University of Tuscia, Department of Forest Environment and Resources (DISAFRI), Via S.Camillo de Lellis snc, 01100 Viterbo, Italy;
3. School of Forest Resources and Environmental Science, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA;
4. Michigan State University, 410 Biochemistry Building, East Lansing, MI 48824, USA