Fig. 7.

General morphology and anatomy of Utricularia bremii spur. a General morphology of the lower corolla lip: palate (P), throat spur (S); bar = 1 mm. b Morphology of nectar spur trichomes and papillae; bar = 30 μm. c General anatomy of the spur: vascular bundle (Vb); bar = 50 μm. d Part of the section through the spur showing structure of trichome and vascular bundle: separated cuticle from the head cells (black arrow), pedestal cell (Pc), basal cell (Bc), xylem elements (x), phloem (Ph); bar = 20 μm. e, f Ultrastructure of head cells; note the paracrystalline protein inclusion (star) in the nucleus (N), dense cytoplasm with mitochondria (m). In the vacuoles (V), there are flocculent electron-dense material and myelin-like figures. Cell-wall ingrowths (arrows) are on the inner surface of the outer wall but also on the inner walls between the terminal cells; thick cuticle (c); bar = 1.1 μm (e) and bar = 1 μm (f)