This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
The Oak Marshall Ward Fig . en Fig Transverse section of cortex and phlegm of oak highly magnified the periderm cork which has replaced the epidermis collenchyma cells of cortex containing crystals of oxalate of lime schlerenchyma cells All these belong to the cortex proper Below these come the phlom groups of hard bast fibers bp