1 1 8 Ford . — The A natomy of 
leaves and roots of young Ceratopteris plants are in close 
connexion with each other. 
6 . The apex of the stem is in the form of a cone, at the 
summit of which a three-sided apical cell is found. 
7. The stem of the young plant is monostelic, at a later 
stage the monostele divides directly into two, and further 
division of the two resulting steles gives rise to the polystelic 
condition of the older stem. 
8. The sporangia are large and scattered. They are spherical 
in shape, with a short stalk, and the annulus may be much 
reduced. 
9. Large numbers of vegetative buds are found. Each bud 
arises at the angle of a leaf and grows by a three-sided apical 
cell. Buds are borne by both sterile and fertile leaves. 
10. Ceratopteris shows stronger affinities with the Poly- 
podiaceae than with any other group of the Leptosporangiate 
Ferns. It has somewhat slighter affinities with the Marsili- 
aceae, and may possibly be intermediate in position between 
these two orders. 
In conclusion I must add that this work was undertaken at 
the suggestion 6f Mr. A. C. Seward, and my best thanks are 
due to him, not only for the material, but also for the many 
suggestions and advice that he has given me throughout. 
