362 The Botanical Gazette. [November, 
groups between the nerves. The mesophyll is in the carene 
restricted to the superior part of this, while a considerable 
layer of stereome covers the inferior face, the center part be- 
ing occupied by a colorless parenchyma of considerable devel- 
opment. 
U. S. Dep't of A griculture, Washington, D. C. 
EXPLANATION oF PLatE XXI.—Sections of the leaf of Leersia safeties 
n epidermis cell of the inferior face of the blade, ph, the roundis®, 
: : ips ; 
i ace, 400, 
inferior face; longitudinal section. X 400,—Fig. 5. © Sa 
front. XX 400,—Fig. 6.—The same, transverse section. X 400 
Transverse section of a part of the blade, including the carene. /, the i ange 
face; BC, the bulliform cells. The specimen from which this os 
taken was collected near Washington, D.C. X 75.—Fig. 8. psc 
but from a specimen collected in Texas. X 75.—Fig. 9 
ing parenchyma sheath (P); a thick-walled mestome sheat 
surrounds the leptome and the hadrome: 5S, the stereome. 
lade, 400, —Fi Fig. 12. 
tome bundle situated on the superior face of the carene. x ey ST. . the 
Part of the leptome of the midrib, showing the sieve tubes /- J 
i X 400. 
companion cells /C) in transverse section. 
