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.
Fucaceae are marked by an entire absence of the asexual method.
It would seem that eight nuclei primarily arise in all Fucaceae, and that a number corresponding to the number of oospheres subsequently formed is reserved, the restbeing discharged to the periphery, where they may be detected at a late stage.