Ceratopteris thalictroides , (Li) 
1 1 1 
Fig. 4 
Fig. 5 
Fig 7 
Fig. 8 
Figs. 2-8. Stages illustrating the development of the Vascular System in Ceratopteris 
thalictroides. Figs. 2 and 3 from a young plant, x 360. Figs. 4-8 from an older plant, 
x 120. e = endodermis, pe — pericycle, x = xylem, st — sieve-tubes, pa — parenchyma, 
l = leaf-trace. 
