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Fig. 353. Fucus, a brown alga 
- Upper left, complete plant, showing holdfast attached to rock and expanded 
fertile tips of the thallus(x 1). The dots in the fertile tips are openings into flask- 
shaped conceptacles containing gametes. The gametes are eggs and spermato- 
zoids, and are found in the same conceptacles or on different plants, depending 
on the species. Below, section of conceptacle showing branched antheridial fila- 
ments and oval odgonia, each of which when mature contains eight eggs (x 69). 
Upper right, antheridial filament with numerous antheridia, each of which 
contains many spermatozoids (x 160) 
