FIG. 5. — Sargassum polycystum C in Molecular-assisted taxonomic study on the Sargassum C.Agardh (Fucales, Phaeophyceae) in northwestern Luzon, Philippines

FIG. 5. — Sargassum polycystum C.Agardh from northwestern Philippines: A, habit of a typical muricate S. polycystum showing stoloniferous holdfast (s) arising from the main axes, these having several cauline blades (ca); B, habit of a female specimen of S. polycystum; C, habit of a male S. polycystum with few secondary axes, some areas showing filiform receptacles; D, portion of an axis showing short protuberances typical to S. polycystum; E, portion of a female S. polycystum specimen showing a smooth surface and numerous, often densely aggregated mucronate vesicles; F, terminal portion of an axis showing young, flattened receptacles (arrowheads) closely associated with ovoid vesicles with short mucro, each vesicle also having long stalks; G, terminal portion of an axis of a male specimen showing branching filiform receptacles (arrowhead) that are closely associated with spherical vesicles with short stalks. Scale bars: A-C, 5 cm; D, E, 1 cm; F, G, 0.25 cm.