Editing Brown algae (section)

===Growth===
[[File:Capo Gallo Dicotoma.jpg|thumb|240px|Growth in ''[[Dictyota dichotoma]]'' occurs at each frond tip, where new cells are produced.]]

The brown algae include the largest and fastest growing of seaweeds.<ref name="Connor1989" /> Fronds of ''[[Macrocystis]]'' may grow as much as {{convert|50|cm|in|sigfig=1|abbr=on}} per day, and the stipes can grow {{convert|6|cm|in|sigfig=2|abbr=on}} in a single day.<ref name="Round1981">
{{cite book
|last=Round |first=F. E.
|year=1981
|title=The Ecology of Algae
|page=103
|location=Cambridge
|publisher=[[Cambridge University Press]]
|isbn=978-0-521-26906-3
}}</ref>

Growth in most brown algae occurs at the tips of structures as a result of divisions in a single ''apical cell'' or in a row of such cells. They are single cellular organisms.<ref name="Dittmer1964" /> As this apical cell divides, the new cells that it produces develop into all the tissues of the alga. Branchings and other lateral structures appear when the apical cell divides to produce two new apical cells. However, a few groups (such as ''[[Ectocarpus]]'') grow by a diffuse, unlocalized production of new cells that can occur anywhere on the thallus.<ref name="Bold1987" />