GAMETOPHYTE AND FIRST STAGES OF THE SPOROPHYTE OF PHYLLARIOPSIS-PURPURASCENS (LAMINARIALES, PHAEOPHYTA)

The gametophytic and young sporophytic stages of Phyllariopsis purpura scens (C. Agardh) Henry et South (Phyllariaceae, Laminariales, Phaeoph yta) were studied in cultures originating from isolated zoospores prod uced by mature sporophytes. Zoospores possess an eyespot that is disce rnible even while the spores are in the sporangium. After germination, dioecious hut sexually monomorphic garnetophytes are formed. Young sp orophytes sometimes have a uniseriate basal portion. The characteristi cs of the gametophytes and young sporophytes are like those of the oth er species of the genus, Phyllariopsis brevipes (C. Agardh) Henry et S outh. This is the third known species of the Laminariales with dioecio us but sexually monomorphic gametophytes.