2 
ERIOCULONEÆ. [21 
face, and in those in which vesicles are here disposed, 
this is invariably an open space left corresponding to each 
stoma, The fact of their existence in the submerged leaves, 
is I believe unparalleled. 
This species is also an exception to M. Brongniart’s rule 
that submerged leaves have no cuticle. However it is an 
exception that strengthens his view, since, as it has a cutis 
as perfectly developed as that of the emerged species, it must 
have stomata for the due performance of its functions. The 
stomata of these plants examined as opaque objects, remind 
one not very inaptly of the large apertures of Hepatice, so 
beautifully illustrated by the celebrated Mirbel. They may 
almost be considered as a link between those, and the more 
general and obscure form. The opening always appears green, 
although from its small transverse diameter, I have not been . 
able to see the vesicle distinctly through it. 
Connected with other points of their structure I may ob- 
serve, that the elongated tissue of the peduncle of E. Walli- 
chianum is minutely punctuated. The punctuations being 
of the same nature with those that have so long puzzled Bo- 
tanists. If they are pores, as some suppose, why is their 
colour not the same, with that of the field in which they are 
viewed, and why is light (at least in the Wollaston arrange- 
ment adapted for doublets), always reflected of a light yellow 
tint. 
Many of these cells, particularly those of the e E. setaceum ; 
contain numbers of green minute granules of irregular size, 
apparently similar to those, by the aggregation of which, the 
green globules are formed, these granules have a very active 
rotatory motion similar to that of a spinning-top, but more 
irregular, there is no motion whatever of ascent or descent. 
5. Eriocaulon setaceum, P]. CLIX. 
1. Transverse section of stem. 
2. Inner view of the convex upper surface of the leaf, with 
attached globules. 
Q 
