The family includes plant viruses with a positive-sense single stranded RNA genome which is divided into 3 components (RNA-1, RNA-2, RNA-3). An additional subgenomic RNA (sgRNA4) arises from the minus-strand copy of RNA3. The viruses replicate in the cytoplasma. The particles are quasi-spherical and bacilliform.
The following genera are currently entered under Bromoviridae: