1918] BLISS—TAXINEAE 57 
The root of Cephalotaxus drupacea (fig. 5) shows the presence of 
resin parenchyma in even greater abundance, and this is the con- 
dition we should expect to find, since the root is the more conserva- 
tive organ of the plant and would retain more fully the primitive or 
ancestral characteristics of the plant. . 
The stem of Torreya taxifolia presents a very different appear- 
ance from the stem of Podocarpus and Cephalotaxus already con- 
sidered. Resin parenchyma cells are present throughout the annual 
ring, but they are much less abundant than in the other stems. 
The distribution of the cells may be seen in the transverse section 
(fig. 6), and the character of the cells is shown very clearly in the 
longitudinal section (fig. 4). 
As previously stated, PENHALLOw did not find resin cells in any 
of the species of Taxus or Torreya which he investigated, and 
DEBary (3) also states that all investigated species of the Coniferae, 
with the single exception of Taxus, have resin passages or resin 
reservoirs. Asa result of my investigation, it is clearly evident that 
resin parenchyma is present in Torreya taxifolia, one of the species 
investigated by PENHALLOW. 
If we examine a transverse section of the stem of Taxus brevi- 
folia (fig. 8), we note the complete absence of resin parenchyma cells. 
A longitudinal section of the same stem (fig. 9) shows even more 
clearly that the vascular cylinder consists simply of thick-walled 
tracheids, with numerous bordered pits, and the characteristic 
spiral thickenings. So far then the condition in Taxus tallies with 
the investigations of PENHALLOW and DeBary; but if we examine a 
transverse section of the root of Taxus cuspidata (fig. 10) we note 
the presence of resin parenchyma diffused throughout the annual 
ring. A higher magnification of a portion of the root is shown in 
fig. 11. Here the resin parenchyma cells are very conspicuous. A 
longitudinal view of the same root also shows a view of these paren- 
chyma cells very clearly (fig. 12). The root of Taxus baccata also 
shows the presence of resin parenchyma diffused throughout the 
annual ring. 
Although in the normal stem of the species of Taxus investigated 
there was no resin parenchyma present, a wounded stem of T. bac- 
cata showed very clearly an extreme development of these cells. 
