Figure 10.6Longitudinal sections through secondary phloem of Arceuthobium globosum. A: sieve tube (p) and adjacent primary xylem (px), x500. B: sieve tubes enlarged to show sieve plates and lateral sieve areas, x1,250. C: lateral sieve areas in surface view, x1,250. D: sieve tube showing oblique sieve plate and lateral sieve areas, x960.
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