1920] 



CHAMBERLAIN— BOTRYCHIUM 



391 



States. It may be possible that differences in the sculpturing on 

 the spore coats may facilitate or impede the penetration of the 



Fig. 1. — Plot 33X40 m. at Sullivan, Ohio, showing Botrychhim virginianum, 

 B. obliquum, and B. dissectum; each dot represents a plant of B. virginianum; 

 each cross, a plant of B. obliquum; and each cross in a circle, a plant of B. dissectum. 



spores to a favorable depth, or may favor or impede the absorp- 

 tion of water, and thus account for the larger number of plants 

 of B. virginianum. 



