Campbell’—Studies on some East Indian Hepaticae . 329 
developed in D. irichocephala than it is in velutina. At maturity there 
is some elongation of the seta which causes the capsule to protrude com¬ 
pletely from the lobe of the receptacle (Text-figs. 1, 2, 3). It opens by four 
somewhat irregular valves, which are usually more or less split so that the 
original lobes are not always readily made out (Text-fig. 1, D, E). The 
parietal cells of the capsule have dark-coloured annular thickenings upon 
their walls, similar to the spiral bands of the elaters. 
The ripe spores of D. irichocephala are somewhat oval in shape, the 
surface covered with small irregular papillae (Text-fig. 1, F, G). They 
A. 
3 
Text-fig. 7. a. Young sporophyte of D. trichocephala. x 255. The sporogenous 
area is shaded. B. An older sporophyte. x 84. 
measure about 20 /x in their longer diameter. The spores of D. velutina 
are much like those of D. trichocephala , but are larger, averaging about 29 /x 
in length. 
As we have already indicated, in its early stages the embryo of 
Dumortiera closely resembles that of Plagiochasma. In its later stages, 
however, both in the form of the sporophyte and the arrangement of the 
cells in the sporogenous tissue, it is much more like Preissia and Mar- 
chantia} In Dumortiera the seta is better developed than in either Preissia 
or Marchantia , but the foot is not so clearly defined. 
1 Meyer: loc. cit., Figs. 62, 70, 72. 
