1886. | BOTANICAL GAZETTE. 325 
‘There is one band of bulliform cells of about twelve rows, extend- 
ing one-half the depth of the leaf, if the deep narrow midvein 
is not taken into account. So far as bulliform cells are concerned 
this reminds us of a leaf of Dactylis glomerata. 
15. C. Pennsylvanica is an early upland sedge with narrow 
leaves. ‘The epidermis (fig. 16) is composed of small cells. There 
are six rows in each bulliform band, and these extend about 
two-fifths of the way down to the lower side of the midvein. 
The epidermal and bulliform cells remind us again of a leaf o 
Dactylis glomerata. 
16. The blade of C. utriculata is very thick, narrowing to 
the margin and in the center. The epidermal cells are of mod- 
erate size; the single band of bulliform cells number about ten 
and are over the midvein. is leaf reminds us very much of 
that of Eriophorum Virginicum, but in the former the vessels of 
ro-vascular bundles are near the upper surface, while in the 
latter they are near the lower side. 
17. In the wide coarse leaf of C. Careyana (fig. 17) the 
upper epidermal cells are rather prominent, varying considerably 
in size. There is one very wide band of about twenty bulliform 
cells over the midvein. In the center of the leaf they extend two- 
fifths of the distance to the base of the vein. About half way 
On t 
epidermal cells resemble a wide shallow band of bulliform cells. 
The leaf of C. Hitchcockiana is much like the last one 
named, and there are many leaves of Carex proper of like 
structure. 
19. The leaf of C. laxiflora, var. latifolia (fig. 18) is about an 
inch wide and rather thin. The epidermal cells are somewhat 
prominent. There is one band in the middle of about ten bulli- 
form cells, which cause this wide leaf to be conduplicate when dry. 
In the leaves of Carex the pitted vessels of the fibro-vaseular 
bundles are near the lower side of the leat. 
It will be seen that all the leaves of sedges have been com- 
pared with some one of five genera of grasses. In the sedges, so 
middle of the leaf to compare with that of Poa pratensis, Phleum 
pratense, Leersia oryzoides, Amphicarpum Purshii, or Panicum 
plicatum. The bulliform cells and other epidermal cells, the 
hypodermal fibres, and the lacune vary more in grasses than in 
sedges, or in other words, we find a greater variety of forms of 
