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Nectar exudation by secretory epidermis in selected Disa species. Irregular nectar patches on a morphologically uniform epidermis of a petal of D. elegans (A) and the spur of D. longicornu (B) and D. uniflora (C, D). (C) Swollen spur epidermal cells after drying with filter paper and incubation in hydration chamber; (D) spur epidermis coated in nectar film. Scale bars: (A–C) = 0·5 mm; (D) = 1 mm.
