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The genus contains viroids similar to the Hop stunt viroid (HSVd). It is related to the genus Pospiviroid and like in that genus the members have a central conserved region (CCR) and lack the ability to self-cleave through hammerhead structures when the circular RNA molecules are formed.
The genus is defined by the nuleotide sequence in the CCR and members share at least 90% of that sequence with HSVd. The circular, single stranded RNA molecule contains 294-303 nucleotides.
The following species are currently entered under Hostuviroid (genus):