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SUMMARY Light and scanning electron microscopy showed the pinnules of maidenhair fern, Adiantum raddianum var. raddianum (Hoshizaki), possess hydrophobic, crystalline deposits overlying a well developed cuticle on both abaxial and adaxial surfaces. In response to attempted infection by Botrytis cinerea (Pers. ex Fr.), browning, cell wall thickening and papilla formation occurred. Transmission electron microscopy revealed infection pegs are surrounded by electron‐dense papillae forming partial barriers to further colonization.
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Archer et al. (1986) studied this question.
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