THE GENUS DICTYOTA (DICTYOTACEAE, PHAEOPHYTA) FROM INDONESIA IN THE HERBARIUM WEBER-VAN-BOSSE, INCLUDING THE DESCRIPTION OF DICTYOTA-CANALICULATA SPEC. NOV

In the framework of a revision of the genus Dictyota J.V. Lamour. in t he Indian Ocean, all specimens from Indonesia present in the herbarium Weber-van Bosse (L) were re-examined. This resulted in a total of 9 s pecies, one species including two different growth forms. Our identifi cations differ substantially from those of Weber-van Bosse (1913). Spe cimens recorded as D. apiculata J. Agardh were re-identified as D. cri spata J.V. Lamour., which is the correct name for D. bartayresiana sen su Vickers; similarly was D. bartayresiana var. beta re-identified as D. cervicornis Kutz., D. fasciola (Roth) J.V. Lamour. as D. ceylanica Kutz. and D. ceylanica Kutz. var. rotundata Weber Bosse as D. friabili s Setch. Dictyota pardalis Kutz. considered as a distinct species by W eber-van Bosse (1913: 184), is treated as a synonym of D. cervicornis. In addition a new combination is made for a growth form of the latter , characterized by recurved branchlets: D. cervicornis f. pseudohamata (Cribb) De Clerck & Coppejans. Dictyota beccariana Zanardini is consi dered to be a synonym of D. ciliolata Send. ex Kutz. A single specimen , previously assigned to D. beccariana, belongs to D. dumosa Borgesen. This is the first report of D. dumosa for the Malayan region. A new s pecies, D. canaliculata De Clerck & Coppejans is described from preser ved material, not reported in Weber-van Bosse (1913).