Pith composed of parenchyma cells and sclerenchyma cells, primary xylem is endarch, secondary xylem with points with halos that dominate, thick radial walls of tracheids, absence of resin canals and axial parenchyma, indicate its relationship to the family Taxaceae.
22.
The term " sclerenchyma " is derived from the Greek ??????? ( " sklr�s " ), meaning " hard . " It is the hard, thick walls that make sclerenchyma cells important strengthening and supporting elements in plant parts that have ceased elongation.
23.
The term " sclerenchyma " is derived from the Greek ??????? ( " sklr�s " ), meaning " hard . " It is the hard, thick walls that make sclerenchyma cells important strengthening and supporting elements in plant parts that have ceased elongation.
24.
Sclerenchyma fibres are not involved in conduction, either of water and nutrients ( as in the xylem ) or of carbon compounds ( as in the phloem ), but it is likely that they may have evolved as modifications of xylem and phloem initials in early land plants.
25.
Bagasse is an extremely inhomogeneous material comprising around 30-40 % of " pith " fibre, which is derived from the core of the plant and is mainly parenchyma material, and " bast ", " rind ", or " stem " fibre, which comprises the balance and is largely derived from sclerenchyma material.
26.
The stem is surrounded by a continuous ring of sclerenchyma that separates it from the root mantle . " T . singularis " stem transverse sections have the same basic structure as Psaronius, but are composed of central vascular bundles having smaller, O-and C-shaped forms, or wavy segments having a short, rounded or fat configuration.
27.
We demonstrate that putative pitchers of " Archaeamphora " are insect-induced leaf galls that consist of three components : ( 1 ) an innermost larval chamber; ( 2 ) an intermediate zone of nutritive tissue; and ( 3 ) an outermost wall of sclerenchyma . " Archaeamphora " is not a carnivorous, Sarraceniaceae-like angiosperm, but represents insect-galled leaves of the previously reported gymnosperm " Liaoningocladus boii"
