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Fig. 15. Longitudinal section through
pith (P), xylem (X), and bark (B) (tissues are between opposite oriented arrows), sampled
seven days after inoculation with Leucostoma persoonii, showing four
polysaccharide-rich reaction zones (large arrows). Colonization from left to right had
proceeded in the bark through the first zone and was almost to the second. Bar = 1 mm.
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