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Fucaceae and Phaeosporeae are doubtless closely allied, and to these Dictyotaceae may be joined, though the relationship is less close.
In Fucaceae and Laminariaceae the inner tissue is differentiated into a conducting system.
In Dictyota, Sphacelariaceae and Fucaceae there is a definite apical cell.
In Fucaceae an apical cell is situate at the surface of the thallus in a slit-like depression at the apex.