360 The Botanical Gazette. [November, 
cells, occupying the largest part of the latter, form groups 
between all the mestome bundles; the stomata are less numer- 
ous, forming only one row on each side of the stereome. 
The mestome bundles represent three degrees in this spe- 
cies, the difference depending upon the following characters: a 
thick-walled mestome sheath in connection with a layer of sim- 
ilarly thickened parenchyma, separating the leptome from the 
hadrome, both of which being well differentiated, are charac- 
of mestome-bundles, all of which lie in the same plane, there 
belong to the superior face of the carene. It is il 
characteristic of Leersia that the leaf possesses such sm 
mestome bundles on the superior face. If there is only ont 
one on each side of the large, median one, whi 
leaf have in all six nerves in the carene, while the other see 
(fig. 7) shows only two. does 
It is difficult to say whether this difference does oF be 
not depend upon the locality. We can only state, - 
specimen from which figure 7 was drawn, was tone was 
Washington, D. C., ina wet place, while the other (fig. ) ris 
taken from a specimen collected in Texas. os ae 
figured a leaf of the same species, and his drawing agree ci- 
fectly with figure 8, but he does not state whether wane 
men was from Europe or from America. jor face 
By examining these small bundles from the superio” 
que, Sens 
tion 
1Histotaxie des feuilles de-Graminées. Annales d. Sc. Nat. Botan! 
VI, vol. 1. (1875.) p. 294. . 
