Brown: REGENERATION IN PHEGOPTERIS POLYPODIOIDES 397 
SUMMARY 
1. Regeneration took place near the base of the petiole of a 
detached leaf of a young sporophyte of Phegopteris polypodioides, 
placed upon sand moistened with Knop’s solution in moist air. 
2. A cellular mass, resembling a prothallium, was formed, from 
which rhizoids, intermediate structures between leaves and pro- 
thallia, and true leaves developed. 
3. At first true leaves resembling those of normal young sporo- 
phytes were formed; then leaves of a much simpler type developed. 
LITERATURE CITED 
~_ 
. Goebel, K. Organography of plants. English translation. Oxford. 
1900 
2, —_———. Einleitung in die experimentelle Morphologie der 
Pflanzen. Leipzig. 1908. 
Kupfer, E. Studies in plant regeneration. Mem. Torrey Club 12: 
195-241. f. 1-3, 1907. 
4. Loeb, J. The organism as a whole. New York. 1916. 
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