34 The Botanical Gazette. [February, — 
minor differences only in the different species of the same — 
genus and non-essential variations in the different genera, 
The seeds of Malvacez are anatropous. The seed coat is 
made up of two integuments. The ovule is made up largely 4 
of parenchymatous tissue which in the early stages contains ~ 
a great deal of starch. Upon the thickening of the endo-_ 
sperm cells this starch disappears. a 
A cross section of a recently fertilized ovule of Walope tri- — 
fida Cav. discloses that’ but a slight differentiation in the 
two integuments has taken place; they are made up of pris- 
matic cells, which in the outer layer are rectangular, while in ~ 
the inner they are more nearly isodiametric. The difference — 
is not alone in form; the outer integument is distinctly clearer 
eral structure of this order is very characteristic. There are 
cells of the outer integument change but slightly, simply in-— 
creasing in size. The small starch grains contained in it 
disappear with the thickening of the walls of the cell. From = 
quite contiguous. 2 
More decided changes take place in the inner integument, — 
The second cell layer takes on a rounded form while the third 
layer of cells has been divided parallel to the endosperm. ee 
the walls the amount of starch diminishes. When t : 
walls have reached their thickness the starch has disappeared 
In a mature palisade cell, a cell cavity may be seen about 
one-third the distance from the outer end. These cave 
often contain a spherical mass resembling a nucleus, wae 
dissolves readily on the application of Schulze’s medium 
Between the cell cavity and the outer end of the palisade ¢€ 
appears the light line which is present in a number of orde 
