1897] THE PHALLOIDE.Z OF THE UNITED STATES 83 
measurements. After completion of elongation the corresponding 
averages vary from 27.24 to 34.2, with a general average of 
31.2 computed on all the measurements. The increase in 
length of diameter of the cells of pseudoparenchyma was there- 
fore about 9% per cent. in the completion of elongation of the 
receptaculum. 
Comparison of the results of Zap. 6 with those of Zaps. 7 and 
8 indicates a gradual increase in the size of the cells of pseudo- 
parenchyma during the whole course of elongation of the recep- 
taculum. The purpose for which these measurements were 
made is to decide, however, whether the cells of pseudoparen- 
chyma at or after the close of elongation of the receptaculum 
are larger in the same plant than at the beginning, or before the 
completion of the process. In Zaps. 6-8, comparison with each 
other of the sets of measurements of corresponding parts of the 
stipe-wall for the two periods covered by the experiments shows 
a marked increase in the size of the cells of pseudoparenchyma 
by the close of elongation. The increase is not confined to the 
pseudoparenchyma at the angles of the folds, but is approxi- 
mately uniform for each part of the same plant, not differing 
much from the percentage of increase for that plant as computed 
from all the measurements. In Ex. 6 the increase of 22 per cent. 
in the average length of diameter of a cell of pseudoparen- 
chyma gives an increase of 81 per cent. in the volume of the 
cell. In other words, each cell of pseudoparenchyma becomes 
nearly twice as large by the close of elongation of the receptac- 
ulum as it was at the beginning of that process. 
Such a general and great increase in the size of each cell of 
pseudoparenchyma in every part of the stipe must find its expla- 
nation in conditions to which all the cells are alike subjected. 
As the reserves of glycogen disappear from the cells during the 
course of elongation, we must conclude that the increase in size 
of the cells of pseudoparenchyma results from their rapid growth 
at the expense of the glycogen accumulated in and about the 
receptaculum, and that such water as is used in the process is 
most probably used as in other cases of growth. The bursting 
