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(A–D) Labellar surface of Xylobium variegatum (K46104) showing callus (A) and verrucae (A–C) whose tips appear to be coated with a film of secreted material, thus obscuring cell outlines (D). Scale bars: A = 500 μm; B and C = 100 μm; D = 25 μm. (E, F) Glabrous or minutely papillose labellum of Xylobium colleyi (K13833) (E) showing detail of papillae (F). Scale bars: E = 500 μm; F = 10 μm.
