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Cuscuta parasitism and extent of ingression into host plants. The upper panel shows close-up photographs of infected test plants whereas the lower panel is toluidine blue-stained cross sections of the host-parasite interface. Red arrows indicate points of haustorium formation. Aa and Ab: coffee, Ba and Bb: tea, Ca and Cb: mango. P, parasite; H, host; HX, host xylem; PX, parasite xylem; SC, host sclerenchyma. Bar top panel = 10 mm, bottom panel = 5 mm.
