Proembryo, mainly used in seed plants, is characterized in other parts of the original residual embryo forming ability.
From the beginning of the fertilized egg plant division, to the part of the organization after secondary differentiation into embryo only when this part is called the primary embryo. This word is used mainly in seed plants, on the wheel algae
(Charophyta) used to be called hydrula to show the difference. Generally four cell line I word or T in font of angiosperms, top two cells become spherical globular embryo, basal cell columns form the suspensor. For example, gymnosperms Pine
(Pinus) the fertilized eggs in each of the 4 rows of 2 free nuclei generated between the cell wall, and then splits again become the 4 4 rows of 16 cells. The top of a row of cells may constitute a groupoid and prosuspensor (raw silk drape). But sometimes the rosette cells develop into embryos, visible in the other part of the original embryo more or less residual primary embryo formation ability.