1899] DEVELOPMENT OF CRYPTOMITRIUM III 
Californica Hampe, a species almost always associated with it, 
is due for the most part to the minute stomata. 
These stomata are surrounded by eight, occasionally seven, 
very symmetrically arranged guard cells (a, fig. z), and not by 
five or six, as stated by Stephani. Each opens into a well- 
developed air chamber (4, fig. 7), 
the boundaries or walls of which 
can be seen easily with a hand 
lens, forming a fine network 
under the epidermis. 
These air chambers are much 
the same as in Fimbdriaria Calt- 
fornica. They are distributed 
irregularly throughout the green 
tissue. Only a single layer of 
cells Separates them, and often one 
> arty is connected with another. 3 
_ Their development begins a little 
; ao back from the apical ht 
: than in the above mentioned 
ccaieb described by Campbell.? Fic. 1.— Stomata of the thallus. @, as 
med general appearance and _ seen from the surface. X600. 4, trans- 
external characters of the ventral. Vem section. X 600. 
a ab been quite thoroughly and accurately described 
ephani (Joc. cit.), and as their development does not differ 
of other allied genera it need not be repeated here. 
ht be expected, both kinds of root hairs, those with 
nn iii 
‘ 
oS 
ap Feceptacle. The development and composition 
oil bodies found in the Hepatic have been thoroughly 
ae ae a 58-60. 1892. : 
‘ ELL, D. H.: Mosses and Ferns, p. 48. 1895. 
od m : Die Oelkérper der Lebermoose. Flora 4a: 1874. 
