PJB-1975-8
Stem anatomy and nodal anatomy of the genus knema
M.rehan
siddiqi and Thomas K. Wilson
Abstract
The anatomy of the young stem and
nodal was investigated in ten species of the genus knema. The young stem is coverec by trichomes . secretory cells, canals, acicular crystals and druses are found in the parenchymatous tissue. The stem has a periderm of superficial origin, cortical sclerieds, plates of sclerieds in
the pith and a pseudo-siphonostetic primary vascular system capped on the outside by groups of separate extraxylary fibers . the phloem is made up of primitive sleve tube elements with a large number of unspecialized sleve areas and oblique end-walls. All species show a unilacular three-trace node.
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