Scope, organization, and purpose of Series III, Flora Malesiana (Musci and Hepaticae) are explained. Collaboration is asked on the following points: (a) To collect Mosses and Hepaticae in Malaysia and to add extensive and detailed data to the specimens (directions available on application to the Editor). (b) To send on loan or donate existing collections. (c) To forward data concerning collectors, travels, and collections made. (d) To name (if necessary provisionnally) all unnamed specimens. (e) To collect data from literature (and to forward reprints). (f) To join the team of bryologists revising groups of Malaysian Bryophyta and to write the Editor about planned research.