201 
Pellia epiphylla , (L.) Corda. 
at their disposal (Fig. 5) ; they then enter the capsule (Fig. 6), ramifying 
between the young gametophytes and in some cases actually entering them 
(Fig. 7). There is also a considerable quantity of hyphae in the capsule- 
wall, in the calyptra, and in the involucre. 
The hyphae in the sporophyte possess cross-walls at regular intervals, 
and the walls are not quite so thick as those of the usual type in the 
gametophyte ; probably this also is due to the presence of the rich food 
Q a 
