Keywords: The Oak (Marshall Ward) Fig 9.jpg en Fig 9 ”Transverse sections through very young twigs of oak showing the vascular bundles of the stem P and X arranged in a ring round the pith and joined by the cambium ring ”the fine line passing through the bundles; M and s the vascular bundles passing down from the leaves ”M the median bundles and s the lateral bundles The external outline is the epidermis; the letters P P stand in the primary cortex; the letters X X stand in the pith; the primary medullary rays separate the bundles After Müller 1892 The Oak A Popular Introduction to Forest-Botany H Marshall Ward PD-old-100 The Oak Marshall Ward |