IN THE POLYPODIACEAE 371 
Adiantum bellum Moore.—Branched prothallia in the various 
species of Adiantum studied occurred only on the distilled water 
cultures. In Fic. 6, A, is shown the only case of branching which 
was observed in A. bellum. Here the filamentous branch origi- 
nated in the first cell of the filament. 
Adiantum Capillus-Veneris L.—Examples of branching among 
the prothallia of this species were frequently observed. In all 
cases the branching was monopodial and in the majority of cases, 
as shown in Fic. 6, B-G, the branches developed from the second 
cell of the filament. Fic. 6, C-E, shows the manner of develop- 
jium Moore, X 175. B-G. 
H. Branched prothallium of 
thallia of A. cuneatum Langsd. 
Fic. 6. A. Branched prothallium of Adiantum be 
Branched prothallia of A. Capillus-Veneris L., X 125. 
A. cardiochloena Kunze, X 125. I-L. Branched pro 
& Fisch., X 125 
ment of the branch and likewise the continued growth of the main 
filament. In Fic. 6, F, no filament had been developed; the 
second cell divided to form the beginnings of the expanded portion 
of the prothallium. From this expanded region the branch was 
given off. 
Adiantum cardiochloena 
developed from the cell which 
vertical wall in the second cell of the filament. 
Kunze.—Fic. 6, H. Here the branch 
was cut off by the formation of a 
