Betaphycus Doty, Eucheuma J. Agardh and Kappaphycus Doty are three important economic red genera that distribute in tropical and subtropical areas, belong to Eucheumatoidae, Solieriaceae, Gigartinales and Rhodophyta, and have been used as raw materials for the production of carrageenan. Samples of the three genera, collected and kept for many years, or received from foreign countries, are deposited in the Herbarium of the Institute of Oceanology, Chinese Academy of Sciences.