Conopholts americana. 17 
he calls them—in the angles of the rhizome and flower stalks, 
quite close to the epidermis. In many thousands of cross 
section of all ages and from all regions I have been unable to 
find anything of the kind. As I have already proved, the 
outer row of bundles is both trace and cauline, while the inner 
is exclusively cauline. Bundles of the inner group occasion- 
ally anastomose with those of the outer, however, and may in 
that way indirectly reach the leaves, although even this seems 
improbable. 
Cross sections of the rhizome, made at its base, show a large 
number of bundles, rather irregularly arranged, it is true, but 
still plainly referable to two rings. 
Chatin’s statement that there are three concentric rings of 
bundles, together with the drawing of the same, can only be 
understood on the supposition that his material consisted of 
very young shoots, of which he made but a single section. 
IX. LE&aAvVEs. 
The leaves of C. americana are numerous and imbricated. 
To their peculiar appearance, indeed, is due the generic name, 
Conopholis, t. e., cone-scale. 
As has been already stated, they are yellowish-brown in 
color, at first inclined to be fleshy, but afterward membranous 
in texture. 
The epidermis consists of thick walled cells, and is much 
better developed on the under than on the upper surface. 
Plate VI, Fig. 6, shows the bead-like thickening of the walls 
in the under epidermis. To this, perhaps, as Chatin suggests, 
is due the absence of stomata on the leaf, and their presence 
in the thinner-walled epidermis of the flower stalk. 
The walls of the parenchyma tissue immediately within the 
lower epidermis are much thicker than those of the same cells 
under the upper epidermis. There is no indication of palisade 
cells. 
The mesophyll resembles greatly, both in the shape and 
2 
