
34 BOTANICAL GAZETTE [ JANUARY 
shows the same structure as in other orders, for example 
Cyperacee, Graminee, etc. The hadrome shows several rela- 
tively wide vessels (reticulated) besides a lacune, in which there 
occurs a ring vessel. The arrangement of the vessels is the 
same as in Graminee, etc., and in no instance was there seen the 
v-shaped hadrome as in the scape. Fhe very smallest of the 
mestome bundles exhibit both leptome and hadrome in two well 
differentiated groups, and several narrow vessels are developed 
in them, bordering immediately on the collenchyma, while the 
leptome has an arch-shaped support of an inner sheath, con- 
stantly incomplete in such small bundles. 
The base of the leaf differs but slightly in structure from 
the middle of the blade. The lacunes are wider, the mesophyll 
is more irregular, and no palisades were observed ; furthermore, 
the inner sheath of the mestome bundles is somewhat more 
thickened, but shows otherwise the same kind of interruptions 
in the small bundles. The epidermis does not seem to have 
become modified in any respect, and both hairs and stomata 
occur. The structure of the apex, however, is very different. 
The epidermis is unchanged, but the mesophyll presents a solid 
palisade tissue in three layers on the lower face, while the upper 
one consists of more roundish cells with narrow intercellular 
spaces; the mestome bundles are fused together into one oval 
group surrounded by a sheath of thin-walled cells, which evi- 
dently corresponds to the outer one, the collenchymatic ; and it 
may be added also that in the apex this sheath is not able to 
resist sulfuric acid. There is thus a single group of mestome in 
the apex, and the leptome seems much reduced, while the had- 
rome occupies a broad space and contains many very wide ves- 
sels, especially reticulated. This single mestome bundle is not 
supported by any hypodermal mechanical tissue or by an inner 
sheath, as farther down the blade. 
THE PROPHYLLUM. 
The prophyllum consists of a very long tubular sheath and a 
short free blade, in both of which there is much the saine 



