iqiq] hill—anatomy of LYCOPODIUM 2^1 



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the protoxylem points. The condition is very similar to • the 

 characteristic stele described for L. Billardieri. The inner cylinder 

 does not remain intact through any great length of stem, but is 

 frequently broken up and gives rise to a parallel-banded arrange- 

 ment or reverts to the radial arrangement. 



Summary 



1. The 2 points of interest in the study of the anatomy of 

 Ly CO podium reflexum are the presence of typical cortical roots 

 and the various "types'' of stele in the stem. 



2. The development and differentiation of the tissues in the 

 steles of the cortical roots parallel those in the stele of the stem. 



3. There are 3 arrangements of the xylem: radial, parallel- 

 banded, and a radial arrangement so modified as to consist of an 

 inner cyhnder of xylem inclosing a small strand of phloem. The 

 last is the most frequently found. 



4. The study confirms my former suggestions that all arrange- 

 ments of xylem may occur in the same stem in species of Lycopo- 

 dium. 



The Pennsylvania State College 

 State College, Pa. 



