There is an enormous diversity in the structure of the flower palate of the carnivorous rootless genus Utricularia. This study aims to examine the structure of the palates in Utricularia bremii Heer and U. minor L of the Utricularia sect. Utricularia, which have a glandular palate type. In both species, the palate has only one type of glandular trichomes. Because of the occurrence of cell wall ingrowths in its glandular cells, any exudation may be transported via eccrinous secretion. It was proposed that the palate trichomes of the examined species act as scent glands and that the palate may play a role as an unguentarium. Both U. bremii and U. minor are of an open flower type. Thus, U. bremii and U. minor flowers can be penetrated by small, weak insects, which then easily have access to their generative structure. Small Hymenoptera (member of families Mymaridae and Braconidae) were observed as flower visitors of the male-sterile species Utricularia bremii.

Department of Animal Histology and Embryology University of Silesia in Katowice 9 Bankowa St 40 007 Katowice Poland

Department of Plant Cytology and Embryology Jagiellonian University in Kraków 9 Gronostajowa St 30 387 Kraków Poland

Faculdade de Ciências Agrárias e Veterinárias Jaboticabal Departamento de Biologia Aplicada à Agropecuária Universidade Estadual Paulista São Paulo Brazil

Faculty of Biology Botanic Garden University of Warsaw Al Ujazdowskie 4 00 478 Warsaw Poland

Institute of Botany of the Czech Academy of Sciences Section of Plant Ecology Dukelská 135 CZ 37982 Třeboň Czech Republic

Wetland Conservation Center ul Cieszkowskiego 1 3 31 01 636 Warszawa Poland

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