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(A–C) Labellum of Bifrenaria wendlandianum (K57074) showing densely pubescent median region (A), stages in the development of short, unicellular trichomes from conical papillae (B) and fully formed, elongate trichomes (C). Scale bars: A = 1 mm; B and C = 100 μm. (D) Labellar surface of Bifrenaria harrisoniae (KLD200501) showing similar, unicellular trichomes. Scale bar = 500 μm.
