PJB-1975-8
Stem anatomy and nodal anatomy of the genus knema
M.rehan
siddiqi and Thomas K. Wilson
DOI:
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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