XXIII] 



MORPHOLOGY 



177 



Fig 458. Pilularia globidifera. « = rlnzome with alternate leaves, and a bud assodated with' each 

 of them: vernafon cn-c.nate. (After Velenovsky.) /.= apical bud, with hairs removed, seen from 

 above. 3-7, successive leaves: by-b,, successive buds, one at the base of each leaf- V,-;v the 

 corresponding roots . = the extreme up-turned lip of a similar apex seen from above: /', /'' the 

 ^nonffnif "f"'"'^ leaves :^,„ the bud corresponding to /". ./= section vertically through a corre- 

 sponding leaf and bud, showing the apical cell of each: h, h, hairs, [a is about natural size: 



Fig. 459. Marsilca quadrifolia L. A small but strong, and richlv fructifyin<r plant 

 (Of natural size. After Luerssen.) ' ^ 



