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STUDY ON THE TYPES OF TRACHEARY ELEMENTS IN EQUISETUM

LI Zhen TAO Ying WANG Xin ZHOU Yunlong(College of Life Science,Beijing Normal University,100875,Beijing,China)  
Xylem isolated from four species of Equisetum rhizomes and aerial axes was examined under a light microscope.It was found that the main tracheary elements of primary xylem were all vessel elements.Distinct morphologic differences were noted in the vessel elements between nodal xylem and internode. The nodal vessel elements were mainly scalariform vessels,which assembled into fascicles and were dumpier than internode.The end-wall perforation plates were scalariform,reticulate and simple,which run parallel to lateral walls that reticulate lateral-wall perforation plates.The internode's vessel elements were mostly annular vessels or spiral vessels.The end walls were oblique or flat with scalariform,reticulate and simple perforations.
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