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Most multicellular algae are immotile in the mature state. However, their reproduction frequently involves the formation and liberation of motile Cells, either asexual reproductive Cells (''zoospores'') or gametes. Figure 26.3 shows the liberation of zoospores from a Cell of a filamentous member of the Chlorophyta, ''Ulothrix''; it can be seen that these zoospores have a structure very similar to that of the ''Chlorogonium'' Cell, illustrated in Figure 26.2(c). The structure of the motile reproductive Cells of multicellular algae thus often reveals their relationship to a particular group of unicellular flagellates.
 
Most multicellular algae are immotile in the mature state. However, their reproduction frequently involves the formation and liberation of motile Cells, either asexual reproductive Cells (''zoospores'') or gametes. Figure 26.3 shows the liberation of zoospores from a Cell of a filamentous member of the Chlorophyta, ''Ulothrix''; it can be seen that these zoospores have a structure very similar to that of the ''Chlorogonium'' Cell, illustrated in Figure 26.2(c). The structure of the motile reproductive Cells of multicellular algae thus often reveals their relationship to a particular group of unicellular flagellates.
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== The Nonflagellate Unicellular Algae==
 
== The Nonflagellate Unicellular Algae==
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