Sentence Examples


  • These spiracles, according to Hinds, are remarkable honeycomb-like structures, and perforations to the tracheal tubes have not been demonstrated.
  • With an apical chambered pneumatophore, from which tracheal tubes may take origin (fig.
  • In a second type they are situated at the ends of tracheal strands and consist of groups of richly protoplasmic cells belonging to the epidermis (as in the leaves of many ferns), or to the subjacent tissue (the commonest type in flowering plants); in this last case the cells in question are known as epithem.
  • In other cases the epithem may be absent altogether, the tracheal strand debouching directly on the lacunae of the mesophyll.
  • The tracheids or vessels, indifferently called tracheal elements, together with the immediately associated cells (usually amylom in Pteridophytes) constitute the xylem of the plant.

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