aie BOTANICAL GAZETTE (serra 
more cells lying in a row. JAGER® with some hesitation agrees with 
STRASBURGER that there are three or four megaspores formed from 
the mother-cell; but it is pretty evident from his figures that he had 
- before him not the spores, but the mother-cells and sterile tissue. 
JAGER also seems to agree with SrRasBURGER that there may be sev- 
eral megaspore mother-cells. I can- 
not confirm these two observers ast 
the number either of the megaspore 
mother-cells or of the potential mega- 
spores into which they divide. In my 
preparations there is no evidence that 
there is ever more than one megaspore 
mother-cell formed. The mother-cell 
is here harder to distinguish than i 
any other plant I have seen. At the 
time its first division occurs, it is long 
Fic. 24. Taxus canadensis; and narrow, resembling closely in 
two prothallia in same ovule; shape the cells adjoining (jigs. 18 and 
embryos in lower, disorganizing 19). It differs from them, howertt 
archegonium in upper. X 43- : . 
in the possession of a rather cot 
spicuous kinoplasmic mass near its lower end, resembling in this 
Tespect the mother-cells in Larix, Taxodium, and Thuja. Very 
rarely there is another smaller kinoplasmic mass above the nucleus 
In jig. 18 the mother-cell is shown in the center with its nucleus ™ 
synapsis. The first division is given in fig. 19. The spindle as here 
shown is at the upper end of the cell, and the division results in cutting 
off a small upper and a large lower part. The second division oocls 
simultaneously in both of these daughter-cells, as is shown 12 eh 
This results in the formation of four potential megaspores, which 
as a rule in a single row (fig. 21). The second division in the rs 
daughter-cell of the first division, however, may in some casts 
: ee ; the twe 
right angles to the longitudinal axis of the ovule, so that : 
upper megaspores lie side by side (fig. 22). The long, nart? . aft 
adjoining the megaspore mother-cell, which as mentioned ea 
well filled with starch, have remained undivided during these ble 
ions. In some cases they divide into two, but they nevet ee 
° Beitrage zur Kenntniss der Endospermbildung und zur Embryologie v" 
baccata. Flora 86:241-288. pls. 15-19. 1899. 
