Origin of Tissues of Schizaea pusilla

Root 1. All the tissues of the root arise from segments cut from a tetrahedral apical cell. 2. The tissues differentiate very early and in the following order: epidermis, cortex, endodermis, pericycle, protophloem, protoxylem, metaxylem, metaphloem. 3. The inner layer of the cortex and the endodermis originate from a common mother cell which is cortical (histogenetic according to Hanson). 4. The pericycle and desmogen strand originate from a common mother cell which is stelar. 5. The root cap formed from segments cut from the fore face of the apical cell remains very simple. Only four cells are formed from each immediate segment. 6. The root hairs persist throughout the life of the root. 7. The root has its origin in a single cell of the meristematic region of the rhizome, the sister cells of which give rise to endodermis and pericycle. Rhizome 8. All the tissues of the rhizome arise from segments cut from three faces of a tetrahedral apical cell. 9. The tissues differentiate early and in the same order as do those of the root. 10. The endodermis and pericycle have a common mother cell which is cortical. Leaf 11. The leaf originates from the first outer derivative of the immediate segment cut from the apical cell of the rhizome. 12. The two-sided apical cell of a rudimentary leaf is transformed into a hemispherical apical cell and finally into a marginal row of meristematic cells. 13. The tissues differentiate in the same order as do those of the root. The endodermis and pericycle have a common mother cell which is cortical.