Brown algae life cycle
Several species of brown algae, such as the Laminaria shown here, have evolved life cycles in which both the haploid (gametophyte) and diploid (sporophyte) forms are multicellular. The gametophyte is different in structure from the sporophyte.
Source
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"OpenStax College, Groups of Protists. October 16, 2013."
http://cnx.org/content/m44617/latest/Figure_23_03_10.png
OpenStax CNX
CC BY 3.0.
