376 Wulist: BRANCHED PROTHALLIA 
Asplenium bulbiferum Forst.—The two examples of branched 
prothallia which are shown in Fic. 10, A, B, developed on the dis- 
tilled water culture. In both cases the branches originated after 
the expanded portion of the prothallia had been formed. In 
Fic. 10, A, the branching was dichotomous. This example is es- 
pecially interesting as showing the tendency of the prothallium 
to revert to a filamentous condition at the time of the formation 
of the filamentous branch. In Fic. 10, B, branching was monopo- 
dial and the branch tended to form immediately a plate of cells. 
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Fic. 11. A-E. Branched prothallia of Phegopteris polypodioides Fée, X 125- 
G. Branched prothallium of Polypodium aureum L., X 125. 
Phegopteris polypodioides Fée—The branched prothallium 
which is shown in Fic. 11, A, occurred in an uncrowded region of 
the soil culture while those shown in Fics. 11, B-E, and 12, F, 
developed in modified Prantl’s solutions. Fic. 11, B-D, was 
found in the Prantl’s solution with K:SQ, omitted, while Fics. 11, 
E, and 12, E, occurred in Prantl’s solution from which CaSO: had 
been omitted. Inall cases observed the branching was monopo- 
dial. In Fic. 11, A, the branch was filamentous in form and 
originated in the second cell of the filament. Fic. 11, B, shows 
