PLATE III.
Fig. 1—TRANSVERSE SECTION OF A PRIMARY ROOT.
- A. p., Heaped layer.
- A. s., Corky layer.
- Ec., Pithy bark.
- End., Endoderm; the thickening of the lateral partitions of its cellules is very apparent.
- P., Pericycle formed of a single layer of cellules.
- T. c., Conjunctive tissue or pith.
- B., Ligneous fasciculous; there are two to the diameter.
- L., Liberian fasciculous; there are two to the diameter, perpendicular to the preceding.
Fig. 2—TRANSVERSE SECTION OF A ROOT; SECONDARY FORMATIONS.
- L. s., Cork, secondary.
- Ec. s., Bark, secondary; the primary formations are exfoliate.
- L., Liber.
- F. l., Ligneous fibres in large numbers and meatus.
- V., Veins of wood, dotted.
- R. m., Medullary radius.
- M. s., Pith which has become entirely sclerotic.
Fig. 3—SCHEMATIC SECTION OF A YOUNG BRANCH.
- Ec., Bark.
- F. f., Foliated fasciculous not yet separated from the central cylinder.
- F. s., Fasciculous stipulaire.
- Mo., Pith.
- Z. g., Generating zone libero-ligneous.
Fig. 4—GRAINS OF STARCH OF THE SEED.
(Maximum dimensions: 22 to 24 p. × 15 to 18 p.)