Ectocarpus,Laminaria

Fig. 28.—Forms of brown seaweeds. A, Ectocarpus, × 50. Sporangia (sp.). B, a single sporangium, × 150. C, kelp (Laminaria), × ⅛. D, E, gulf weed (Sargassum). D, one-half natural size. E, natural size. v, air bladders. x, conceptacle bearing branches.

Done