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(A–F) Labellar surface of Xylobium squalens (K12658) showing callus (A) and verrucae (A–C) with poorly defined cells at their tips (D). This may be due to the presence of a film of secreted material, traces of which can be seen upon and between the labellar papillae (E, F). Scale bars: A = 500 μm; B and C = 100 μm; D = 25 μm; E and F = 5 μm.
