2010b-615 aufsatzsammlung champignons encyclopedias etiology fungalviruses fungi genetics genome molecularvirology molekularbiologie mushrooms nature pathogenese pathogenesis pathogenicity pilze plants plantviruses qw160n841v2010 textbooks viral viren virology virusdechampignons virusdiseases viruses virusphytopathogènes wf3000 xd7000