English: Cross section of leaf Pinus heldreichii 'Den Ouden' (Bosnian pine tree). Diameter of section is 1mm, thickness is 30 mkm, author's permanent specimen, author's method for polychrome tissue colouring. It is difficult to get high-grade plant sections and then to color it well.
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Captions
Pine leaf Pinus heldreichii 'Den Ouden', transverse section