Shadowcast transmission electron micrograph (TEM) of brown algae belonging to the genus Fucus; sperm with detail of the proboscis and the short mastigonemes which are stiff flagellar hairs (top). These are major colonizers of rocky shores in littoral and sublittoral zones; some occur in deep oceans as floating plants. Magnification: 6,000X at 4.5 x 6.5" print size.