Characteristics of the phloem

Outside the peripheral circle of vascular bundles is a parenchy-matic zone, which is delimitated by the lateral meristem and the phellem (Fig. 7-9). Many idioblasts with rhaphides are in both Mesembryanthemum species (Fig. 9).

raphid

Fig. 7. Bark with a small phloem with small cells, large parenchyma cells and very thin-walled phellem cells (black and red). Root collar of a long hanging chamaephyte with succulent leaves, wall, thermophile zone, subtropical climate, Gomera, Canary Islands. Aptenia cordifolia, transverse section.

raphid

Fig. 8. Bark with a small phloem with small cells, a primary bark with large parenchyma cells and an irregular, very thin-walled phellem. A lateral meristem consisting of a band of small cells is outside of the phloem. Root collar of a succulent 10 cm-high plant, rud-eral site, thermophile zone, subtropical climate, Gomera, Canary Islands. Mesembry-anthemum nodiflorum, transverse section.

Fig. 7. Bark with a small phloem with small cells, large parenchyma cells and very thin-walled phellem cells (black and red). Root collar of a long hanging chamaephyte with succulent leaves, wall, thermophile zone, subtropical climate, Gomera, Canary Islands. Aptenia cordifolia, transverse section.

Fig. 8. Bark with a small phloem with small cells, a primary bark with large parenchyma cells and an irregular, very thin-walled phellem. A lateral meristem consisting of a band of small cells is outside of the phloem. Root collar of a succulent 10 cm-high plant, rud-eral site, thermophile zone, subtropical climate, Gomera, Canary Islands. Mesembry-anthemum nodiflorum, transverse section.

Fig. 9. Bundles of rhaphides in idioblasts in the parenchyma zone of the primary bark. Root collar of a succulent 10 cm-high plant, ruderal site, thermophile zone, subtropical climate, Gomera, Canary Islands. Mesembryanthemum nodiflorum, transverse section, polarized light.

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