Fucus has a life history with a gametic meiosis. Thus, there is no alternation of generation. Male and female gametes are produced within specialized gametangia clustered together in conceptacles. Eggs and sperms are released and the resulting zygote attaches and develops into the sporophyte.

from: http://biodidac.bio.uottawa.ca/Thumbnails/showimage.cfm?File_name=Phae007b&File_type=gif