ON NAIAS GRAMINEA DEL., VAR. DELILEI MAGNUS. 918 
with them so regularly oval nor so acute as they are represented in 
Braun’s figure (fig. 14, Plate 251); on the contrary, I never find them 
acute, and, though somewhat parallel-sided, they gradually taper 
om their base to their elongate truncate apex (see figs. 52 and 54). 
More often than not the auricle is larger on one side than the other, as 
in figs. 54 and 55. The auricles are confined principally to the first 
a 
an 
Fia, 54. 
pair of leaves of each fascicle, and the sheaths of the pair embrace the 
leaf; most often these are the only leaves in the fascicle which 
sinus with the lamina (fig. 55); but as we approach the centre of 
j } 
} | destitute of auricles, and 
pass into short lanceolate 
bracts, in the midst of 
which we find the flowers. 
In Scotch specimens 
sheath is of another type; 
the base of the limb widens 
outintoasheath more than 
limb, and at an angle of 
'- about 45°; but there is no 
ap an auricle on 
either side. The shoulders 
of the sheath are crowded 
with teeth, but they are 
infrequent on the sides. 
56 and 57, and 
