~~ 
NortH Haven Sanp PLarns 601 
small intercellular spaces, the epidermal layer having thicker walls. 
The sclerenchyma-cells show lamellae and pits. 
SPARTINA CYNOSUROIDES. — Central portion of root is provided 
with vessels arranged in the form of a circle as seen in cross-sec- 
tion, with the phloem tissue immediately surrounding the circle of 
vessels. Endodermis apparent, formed of small, rather thin- 
walled cells joined on the outside by three or four rows of thick- 
walled circular cells with large intercellular spaces. From this 
tissue narrow strands of cells extend to the cortex, forming im- 
mense lacunes. Small simple root-hairs extend from the outer 
cells of the cortical layer. The central portion inside the circle of 
vessels is made up of rather thin-walled cells appearing circular in 
cross-section, with intercellular spaces at the angles. There is no 
starch. The structure of the root is shown on f/. 27, 7. 
Diameter of root, 1.5 mm. 
‘« “© ‘central cylinder, 0.6 mm. 
‘s ‘Jargest vessels, 37 
CYPERUS FILICULMIs. — The material examined shows a single 
large vessel in the center of the root surrounded by rather small 
cells apparently empty. Endodermis composed of very thick- 
walled cells next to cortex. These are light-brown in color and 
show both lamellae and pits. Cortex dark-brown in color and 
made up of large rectangular cells with rather thick walls (see p/. 
27, a). 
Diameter of root, .I5 mm. 
ss —_** central cylinder, .II mm. 
hem tS) eager 33 # 
Corm: transverse sections show it to be made up of rather 
thin-walled parenchyma-cells densely packed with starch. These 
cells are circular, hexagonal or pentagonal in shape with pitted 
walls, Small intercellular spaces occur at the point of union of 
three cells. Spiral vessels occur in the bundles, which are small 
and irregularly distributed throughout the central portion of the 
thizome. Certain cells are filled with peculiar brown substance 
Presumably the same as is found in the leaves. This does not 
dissolve upon long standing in xylol. 
STENOPHYLLUS CAPILLARIS.— The material examined shows a 
single large vessel in the center of root, surrounded by thick- 
