Cadang-cadang is a serious lethal disease of coconut palms in the Philippines. Infectivity is associated with four viroid RNAs (ccRNAs) which are from 246 to 574 residues in size but do not vary in sequence complexity. They share sequence and structural homology with other viroids. Variant ccRNAs found in nine isolates sequenced may have arisen as by-products or intermediates of viroid replication.