Różnorodność form w rzędach elementów trachealnych komórek roślinnych

This paper reviews non classical forms of tracheary elements. Various forms of the tracheary elements were presented as follows: circular tracheids and vessels, zigzag, branched and heterogeneous vessels. The shapes and localizations of the vessels types were showed on figures and micrographs. It seems that access to information recorded in shape and size of woody cells could help for a better undertstanding of physiological functions of vascular system in woody plant.