Campbell'.—Studies on some East Indian Hepaticae. 335 
ventral segments of the apical cell. A short distance behind the apical cell, 
on the dorsal surface of the thallus, small depressions are evident between 
some of the cells. These are the first evidences of the series of dorsal air- 
chambers. These in their further development do not show any departure 
from the type found in Targionia 1 and Fegatella , 2 The chamber opens at 
the surface by a simple pore or ‘ stoma ’ (PI. IX, Figs. 19, 30), and the 
floor of the chamber is occupied by papillate cells, which sometimes show 
a transverse division. These cells contain a few large chromatophores, and 
closely resemble those found on the free surface of the thallus in Dnmortiera 
velutina. 
The ventral scales are better developed than in Dumortiera. Each 
scale consists of a broad basal portion and a nearly semicircular terminal 
Text-fig. io. a. Ventral scale of Wiesnerella showing the terminal appendage (x). x 285. 
B. Three rhizoids of Wiesnerella. x 285. 
appendage (Text-fig. 10, a). Numerous rhizoids, much like those in Dumor¬ 
tiera calcicola , are developed on the ventral surface of the thallus, especially 
along the axis (Text-fig. 10, b). 
Wiesnerella is monoecious, the receptacles closely resembling those of 
Dumortiera , but the male receptacles are smaller than in either D . tricho - 
cephala or D. velutina. The carpocephalum (PL IX, Fig. 14) is sym¬ 
metrically star-shaped; with usually 5-6 rays, and slightly convex. It is 
borne on a long, slender pedicel. 
A few very young receptacles were found, showing that their early 
development is essentially the same as in Dumortiera ; but material was not 
1 Campbell : loe. cit., p. 48. 
2 Cavers : On the Structure and Biology of Fegatella conica. Ann. of Bot., vol. xviii, 1904, 
p.87. 
Z 
