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Naphthol blue black (NBB) staining of various non-glandular trichomes of the selected Pinguicula species that were examined; note the lack of protein bodies in the cytoplasm. Nucleus (asterisk). (A) P. agnata; scale bar = 50 µm. (B) P. albida; scale bar = 50 µm. (C) P. esseriana; scale bar = 50 µm. (D) P. vulgaris; scale bar = 50 µm.
