64 BOTANICAL GAZETTE [JANUARY 
cells at the node. The epidermis, which is pushed out, persists 
for a considerable time as the temporary root-sheath. The root _ 
cap while young adheres to the main body of the root, but later 
becomes entirely free except at the growing point. The number — 
of cells constituting the meristem region is unusually small, 
sometimes being reduced to one or two. An axial strand of 
undifferentiated cells is the representative of the conducting 
system of the root. | 
3. ‘Flowers are rarely formed, and when present part or all 
of their organs may disorganize at any stage in their develop- 
ment. 
4. In young flowers the nucellus and stamen papilla first 
appear, and about the nucellus is the beginning of the carpél. 
The spathe appears outside of the carpel and stamen papilla. 
The two stamens arise from the branching of the papilla. 
5. A single archesporial mass appears in each stamen. This — 
is later divided into two, then into four masses, constituting the 
archesporial masses of the four loculi of the anther, which four 
loculi constitute one and not four sporangia. S 
6. The primary tapetal layer is not cut off at the first division 
of the archesporial cells, but after these have become separated 
into four regions, 
7. It seems clear that the tapetum is not a morphological 
but a physiological layer. | 
8. After the microspore mother cells have become free the 
cells of the tapetum frequently divide, pushing into the cavity 
of the loculus. 
. ae -tiont 
9. Many microspore mother cells disintegrate and function 
as tapetal cells. : 
10. The microspores germinate within the sporangium. be 
generative cell remains closely applied to the wall of the spe 
for a time before dividing. , all 
II. In the megasporangium the primary tapetal cell usi 
undergoes no further division, while the primary sporogen 
cell passes directly over into the megaspore. : 
12. Normal embryo sac structures are developed 1n L. 
