Initial cell in root apex of Equisetum

Zones of cell lineage

Schematic diagrams of the root apex of horsetail (Equisetum hyemale) showing zones of cell lineage from the derivatives of the apical cell (shown in brown).

1) a longitudinal section

2) three-dimensional diagram of the division of an initial cell

3) a transverse section of the apex at the level of the initial cell

4) rootcap

5) protoderm

Darkened cell walls represent cell lineages derived from a single division of the apical cell. Each division of the apical cell may give rise to a lineage of tens to hundreds of cells.