ConofiJio/is auicricana. 1 7 



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 mner 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. Leaves. 



The leaves of C. americana are numerous and imbricated. 

 To their peculiar appearance, indeed, is due the generic name, 

 Coiiopholis, i. c, 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 



