ceratophyllum: constituting the family Ceratophyllaceae: hornworts
magnoliid dicot genus: genus of dicotyledonous flowering plants regarded as among the most primitive of extant angiosperms
virino: (microbiology) a hypothetical infectious particle thought to be the cause of scrapie and other degenerative diseases of the central nervous system; consists of nucleic acid in a protective coat of host cell proteins