Mark all possible ways how a massive brown algae like Fucus or Laminaria can grow a branch oriterate a new blade. Looking into the Raven book is helpful, but will not tell all.
a. Activation of cell division of any cell anywhere.
b. Longitudinal division of the apical cell.
c. Activation of cell division of a peripheral cell or cell group (epidermis or just below)
d. Outgrowth from filamentous structures in conceptacles or along the margin
