Brown: Regeneration in Phegopteris polypodioides 397 



Summary 



1. Regeneration took place near the base of the petiole of a 

 detached leaf of a young spo^ophyte 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 



1. Goebel, K. Organography of plants. English translation. Oxford. 



1900, 



2. . Einleitung in die experimentelle Morphologic der 



Pflanzen. Leipzig. 1908. 



3. Kupfer, E. Studies in plant regeneration. Mem. Torrey Club 12: 



195-241. /. 1-3, 1907. 



4. Loeb, J. The organism as a whole. New York. 1916. 



