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Fig. 1. A, Nicotiana tabacum leaf surface showing exudate laden GSTs and simple trichomes ×110. B, N. tabacum hydathode ×700. C, N. tabacum GST glands with exudate removed, pretreated with 5 % HOAc then silver nitrate–rubeanic acid to stain calcium oxalate crystals ×560. D, N. tabacum GST glands, treated as in C, but first pretreated with 0·25 m HCl to disolve calcium oxalate ×560. C and D by Vogeli‐Lange and Wagner, unpublished.
