Fucus

Fig. 26.—A, a branch of common rock weed (Fucus), one-half natural size. x, end of a branch bearing conceptacles. B, section through a conceptacle containing oögonia (og.), × 25. C, E, successive stages in the development of the oögonium, × 150. F, G, antheridia. In G, one of the antheridia has discharged the mass of spermatozoids (an.), × 150.

Done