$iz Wuist: BRANCHED PROTHALLIA 
Adiantum cuneatum Langsd. & Fisch.—Fic. 6, I-L. Branch- 
ing in this species occurred at an early stage in the development 
of the prothallia. The branches originated in the first cell of the 
filament and the growth in all cases was very rapid. In Fia.6, L, 
is shown a prothallium with a branch as long as the main filament. 
Adiantum trapeziforme L.—Fic. 7, A-G, represents branched 
prothallia of this species. Here branching was both dichotomous 
and monopodial. In Fic.7, E, is shown an unusual case of dichot- 
omous branching where both branches tended to grow in the 
same direction. 
D 
Fic. 7. Branched prothallia of A. trapeziforme L., X 125. 
Camptosorus rhizophyllus (L.) Link.—Fic. 8, A-D, shows 
branched prothallia of this species which developed on the distilled 
watercultures, while Fic. 8, E, shows a prothallium which developed 
on the inner surface of the pot wall of the soil cultures. Fi. 8, 
A-D, shows the beginnings of branching in very young prothallia. 
Branching in two of the cases was dichotomous and in the other 
two cases monopodial. A few days after the spores were sown on 
the distilled water, germination took place in the normal manner. 
In Fic. 8, A, the first prothallial cell instead of dividing by a trans- 
