Five sterols were identified in Cystoseira barbata and seven sterols i
n C. crinita. Saringasterol appeared to be an artefact. Volatiles in C
. barbata consisted mainly of halogenated hydrocarbons, while in C. cr
inita terpenoids predominate. The results obtained can be used in chem
osystematics. (C) 1997 Elsevier Science Ltd.