292 



FOUNDATIONS . OF BOTANY 



an embryo. This grows, remaining for a time attached to the 

 macrospore, and at length forms a new spore-plant. 



THE STUDY OF A SCOUEING-RUSH {EQUISETUM) 



359. Occurrence. — The common horse-tail, Equisetum arvense, is 

 widely distributed in the United States, east, west, north, and south. 

 It is very often found on sand hiUs and along railroad embankments. 



Fig. 212. — Plant of Lycopodlum (i. annotinwn). 



The fruiting stems appear very early in the spring and are of short 

 duration. The sterile vegetative growth follows, becoming well 

 grown in June. 



360. Examination of Rootstocks and Soots. — Examine the under- 

 ground portions of the plant with reference to general size, position, 

 color, shape, and position of notches. After studying the stems 



