Marinus Roos Guest Name Dr. M.C. Roos Telephone +31 71 527 2727 E-mail marco.roos@naturalis.nl News 17 June 2019 Counting plants and small freshwater creatures for citizen science 02 June 2009 Plant species disappear and reappear Guest Science Instituut Biologie Leiden IBL Algemeen Contact +31 71 527 2727 marco.roos@naturalis.nl Publications Naturalis Biodiversity Center Onderzoeker