Extended Data Fig. 5: Images of life cycle stages of Fucus and Ectocarpus.

A, Embryo stages of F. serratus and F. distichus. In both species, the embryos go through phases of polarization, cell-type differentiation and proliferation of established cell types. B, Adult tissues of F. serratus and F. distichus. C, Gametes of F. serratus and F. distichus. D, Ectocarpus life cycle stages with a scheme to link the sampled stages. ‘GA’ and ‘(P)SP’ denote multicellular gametophytes and (partheno)sporophytes, respectively. The red arrows point to unicells.