The Viruses
   The Subviral Agents
     Viroids
       Family Pospiviroidae
         Genus Pospiviroid
           1 Chrysanthemum stunt viroid
           2 Citrus exocortis viroid
           3 Columnea latent viroid
           4 Iresine viroid 1
           5 Mexican papita viroid
           6 Potato spindle tuber viroidᵀ
           7 Tomato apical stunt viroid
           8 Tomato chlorotic dwarf viroid
           9 Tomato planta macho viroid