Conclusion

Understanding the tissues and their associated cells allows the microscopist to differentiate between the various plant parts he or she will be examining (Table 8.5). The following chapter presents the manner in which the tissues and cells are arranged within a plant organ. It is their arrangement that gives a plant its unique and diagnostic fingerprint for purposes of identification.

FIGURE 8.6 Characteristics of tracheary elements (xylem showing vessels and pitted cells, and cell walls). (a) Secondary xylem of Eleutherococcus senticosus showing vessels, fibers, and pitted cells of a medullary ray (transverse section); (b) vessel with bordered pits embedded in fibers of Eleutherococcus senticosus root (longitudinal section); (c) pitted fibers and bordered pitted vessels of Berberis aquifolium (longitudinal section); (d) vessel with bordered pits of Berberis aquifolium root (longitudinal section). (Images courtesy of Prof. Dr. Reinhard Länger, AGES PharmMed, Vienna, Austria.)

FIGURE 8.6 Characteristics of tracheary elements (xylem showing vessels and pitted cells, and cell walls). (a) Secondary xylem of Eleutherococcus senticosus showing vessels, fibers, and pitted cells of a medullary ray (transverse section); (b) vessel with bordered pits embedded in fibers of Eleutherococcus senticosus root (longitudinal section); (c) pitted fibers and bordered pitted vessels of Berberis aquifolium (longitudinal section); (d) vessel with bordered pits of Berberis aquifolium root (longitudinal section). (Images courtesy of Prof. Dr. Reinhard Länger, AGES PharmMed, Vienna, Austria.)

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