Fig. 6.

General floral morphology and spur structure of Utricularia australis. a Floral morphology of U. australis (Australian population) from the collection of aquatic carnivorous plants in the Institute of Botany at Třeboň: spur (arrow). b Part of the section through the spur with glandular trichomes and papillae: pedestal cell (arrow), basal cell (Bc), papilla (p), parenchyma cell (pa), intercellular spaces (star), external epidermis (ep); bar = 20 μm. c Nectar trichome distribution inside the spur; bar = 1 mm. d Morphology of nectar trichomes and papillae; note that one trichome had a three-celled stalk; additional cell (arrow), swollen cuticle of the head cells (star); bar = 50 μm