sclerenchyma tissue

thickened intercellular sclerenchyma tissue structure anatomy cell vascular bundle collenchyma secondary phloem lignified corners transverse sclereids narrow pit wall fibre view cellulose protoplasm education xylem cytoplasm botanical pith cambium meristems vacuole growth plant stem parenchyma sclereid biological fibers explanation system longitudinal scheme ecology outline graphic cells lumen diagram leaf cross nature side vector molecular root plants botany internal microscopic science labeled educational biology epidermis infographic cortex design