In order to rich molecular biology information of Nosema philosamiae isolated from the insect of Lepidoptera,Philosamia cynthia ricini. The complete sequence of ribosomal RNA gene(4314bp) was obtained by specific PCR amplification,cloning and sequencing. Sequences for the large subunit gene(LSUrRNA:2497bp) ,the internal transcribed spacer(ITS:188bp) ,the small subunit gene(SSUrRNA:1232bp) ,intergenic spacer(IGS:282bp) ,and 5S region(115bp) are also given. We show here that the organization of the rRNA of N....