Introduction

Definition

Taxonomic Structure of Viroids

Physical Chemical and Physical Properties

Genome Organization and Replication

Antigenic Properties

Biological Properties

Host Range

Transmission

Cross Protection

Phylogenetic Relationships

Family Pospiviroidae

Taxonomic Structure of the Family

Distinguishing Features

Genus Pospiviroid

Distinguishing Features

List of Species Demarcation Criteria in the Genus

List of Species in the Genus

Species in the Genus

Tentative Species in the Genus

Genus Hostuviroid

Distinguishing Features

List of Species Demarcation Criteria in the Genus

List of Species in the Genus

Species in the Genus

Tentative Species in the Genus

Genus Cocadviroid

Distinguishing Features

List of Species Demarcation Criteria in the Genus

List of Species in the Genus

Species in the Genus

Tentative Species in the Genus

Genus Apscaviroid

Distinguishing Features

List of Species Demarcation Criteria in the Genus

List of Species in the Genus

Species in the Genus

Tentative Species in the Genus

Genus Coleviroid

Distinguishing Features

List of Species Demarcation Criteria in the Genus

List of Species in the Genus

Species in the Genus

Tentative Species in the Genus

Family Avsunviroidae

Taxonomic Structure of the Family

Distinguishing Features

Genus Avsunviroid

Distinguishing Features

List of Species Demarcation Criteria in the Genus

List of Species in the Genus

Species in the Genus

Tentative Species in the Genus

Genus Pelamoviroid

Distinguishing Features

List of Species Demarcation Criteria in the Genus

List of Species in the Genus

Species In The Genus

Tentative Species in the Genus

List of Unassigned Viroids

Derivation of Names

References

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Figure Gallery