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Vitekorchis excavata: SEM. (A, B) Papillose labellar callus bearing glabrous rugae (A) and projections (B). (C) Detail of glabrous epidermal cells overlying rugae. Unicellular, conical papillae and trichomes occur between the projections and rugae. Stomata are indicated by arrows. (D) Residues of secreted material (arrows) on the cuticular surface of glabrous epidermal cells. Scale bars = 600 μm, 500 μm, 100 μm, 40 μm, respectively.
