Characteristics of the phloem and the cortex

All species are characterized by the presence of a sclerenchyma belt in the cortex (Fig. 13). Single sclerenchyma groups in different quantities occur in the phloem of all species (Figs. 14 and 15). Tangential sclerechyma belts can be found in the phloem of Liquidambar styraciflua (Fig. 16) and Sycopsis sinensis. Prismatic crystals of different sizes occur in all species. The occurrence of crystal druses in the multiple-layered phellem is specific to Liquidambar styraciflua (Figs. 16 and 17).

ra c

Fig. 11. Medullary secretory canal in the pith located at the initial part of a vascular bundle. Long shoot of a 4 m-high tree, cultivated, hill zone, temperate climate, Botanical Garden Zürich, Switzerland. Liqui-dambar styraciflua, transverse section.

ra c pith

Fig. 11. Medullary secretory canal in the pith located at the initial part of a vascular bundle. Long shoot of a 4 m-high tree, cultivated, hill zone, temperate climate, Botanical Garden Zürich, Switzerland. Liqui-dambar styraciflua, transverse section.

Fig. 12. Pith of a diffuse-porous wood. Medullary canals are absent. Long shoot of a 2 m-high shrub, cultivated, hill zone, temperate climate, Botanical Garden Basel, Switzerland. Corylopsis pauciflora, transverse section.

Fig. 12. Pith of a diffuse-porous wood. Medullary canals are absent. Long shoot of a 2 m-high shrub, cultivated, hill zone, temperate climate, Botanical Garden Basel, Switzerland. Corylopsis pauciflora, transverse section.

Fig. 13. Bark with distinct ray dilatations, a tangential band of sclerenchyma in the cortex and groups of sclerenchyma in the phloem. Long shoot of a 2 m-high shrub, cultivated, hill zone, temperate climate, Botanical Garden Zürich, Switzerland. Disty-lium racemosum, transverse section.

Left Fig. 14. Bark with a tangential band of sclerenchyma in the cortex and groups of sclerenchyma in the phloem. Stem of a 1.5 m-high shrub, cultivated, hill zone, temperate climate, Botanical Garden Zürich, Switzerland. Fothergilla gardeni, transverse section.

Right Fig. 15. Bark with ray dilatations, a tangential band of sclerenchyma in the cortex and many groups of sclerenchyma in the phloem. Stem of a 3 m-high shrub, cultivated, hill zone, temperate climate, Botanical Garden Zürich, Switzerland. Fortu-nearia sinensis, transverse section.

Left Fig. 16. Bark with distinct ray dilatations, tangential bands of sclerenchyma in the older phloem and groups of sclerenchyma in the younger phloem. A large phel-lem is present outside the cortex. Stem of a 4 m-high tree, cultivated, hill zone, temperate climate, Botanical Garden Zürich, Switzerland. Liquidambar styraciflua, transverse section.

Right Fig. 17. Phloem with prismatic crystals and crystal druses. Stem of a 4 m-high tree, cultivated, hill zone, temperate climate, Botanical Garden Zürich, Switzerland. Liquidambar styraciflua, transverse section.

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