Characteristics of the phloem and the cortex

The anatomy of the bark of the Plumbaginaceae is heterogeneous. All species are characterized by the absence of crystals. The phloem and the cortex are simply structured in most species (Fig. 15). Distinct groups of sieve tubes are present only in Armeria arctica. Sclereids occur sporadically and are clustered in small, tangentially oriented groups (Armeria arenaria; Fig. 16) and in irregular groups (Limonium insigne and L. pectinatum; Fig. 17). Ray dilatations were only observed in Armeria arenaria (Fig. 16).

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Fig. 17. Irregular, sclerenchymatic groups surrounded by a uniform parenchymatic tissue. Root collar of a 20 cm-high cham-aephyte, subtropical climate, coast, Gran Canaria, Canary Islands. Limonium pecti-natum, transverse section.

Fig. 15. Simple construction of the phloem. Sieve tubes are smaller than parenchyma cells. Root collar of a 15 cm-high chamae-phyte, meadow, subalpine zone, Pyrenees, Spain. Armeria alpina, transverse section.

Fig. 16. Phloem with small groups of fibers embedded in a tissue of parenchyma and sieve tubes. Characteristic of all species are dilatations. Root collar of a 15 cm-high chamaephyte, dry meadow, mountain zone, France. Armeria arenaria, transverse

Fig. 17. Irregular, sclerenchymatic groups surrounded by a uniform parenchymatic tissue. Root collar of a 20 cm-high cham-aephyte, subtropical climate, coast, Gran Canaria, Canary Islands. Limonium pecti-natum, transverse section.

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