The following five species of marine red algae are reported from Malaysia f
or the first time and their characteristic features are described: two spec
ies of Martensia (Delesseriaceae, Ceramiales), M. australis Harvey and M. f
ragilis Harvey, two species of Herposiphonia (Rhodomelaceae, Ceramiales), H
. pacifica Hollenberg and H. vietnamica Pham, and Neosiphonia flaccidissima
(Hollenberg) M. S. Kim ct I. K. Lee (Rhodomelaceae, Ceramiales). The prese
nce of Polysiphonia scopulorum Harvey in Malaysia is confirmed.