360 The Botanical Gazette. [June, 
numerous mestome bundles and large lacunes in which dia- 
phragms are to be found (as shown in fig. 7), somewhat re- 
sembling those which characterize various species of Juncus. 
Washington, D. C. 
EXPLANATION OF PLaTes XXVII anp XXVIII. 
face, those of the inferior face being the largest. The lacunes (Z) are 
Separated by narrow strata of colorless parenchyma. mestome 
a 
bundles a, 4, ¢c, represent respectively first, second and third degree of 
Seetopmpent, TS 
ig. 
showing deep foldings inward; P, cells of the parenchyma-sheath; 
Fig. 6. Epidermis of the superior face, #2, bordering on a group 
X 320. 
°. A very small mestome bundle, representing the fourth oe 
cu of development, from the colorless parenchyma of the keel. 
340. 
