Notes. 
384 
sporium, there grew from the apex of the sporangium a short filament ; 
and sometimes two filaments grew out from the upper part of the 
sporangium diverging so as to form an angle of 45 0 . The terminal 
cell of the filaments was usually bluntly conical, the succeeding cells 
being cut off by walls at right angles to the axis of growth. In the 
simplest cases the filaments remained unbranched and composed of 
a single row of cells which usually became curved. In Fig. 18 is 
shown a case where the filament, whose cells contained abundant 
chlorophyll, might well be compared with a moss-protonema. In 
some cases the filaments had grown to double the length of that 
shown in Fig. 18. 
More frequently, however, after the formation of the first two or 
three cells, the divisions were oblique and regularly placed, and, in 
some instances, the first partition itself was oblique and the subsequent 
divisions regularly oblique as in the tips of the narrow Delesseriae. 
As a rule, the filaments, even where oblique partitions were formed, 
remained nearly linear or cylindrical ; but there were numerous cases 
where, by irregular division, a small prothalline body of a single layer 
of cells was formed. Such a growth is showm in Fig. 19, where it will 
be observed that a considerable number of the superficial cells of the 
aborted sporangium have grown outwards as if to produce other 
filaments or prothalli. 
In a few cases, the initial sporangium had, at a very early stage, lost 
