THE BOSTON FERN REPRODUCES ONLY BY RUNNERS 



Figure 6. Many species of ferns reproduce both by runners and by spores, but the Boston 

 fern produces no spores, so that new varieties arise only as bud variations of the stolons or run- 

 ners, which are given ofi in association with each leaf The stolons bear the ^ofs which supply 

 the main stem and leaves with food, and at intervals they also give rise ^^ "^w i^knts by budd n^^ 

 The plant shown is a type of sword fern collected in Porto Rico for the New \ ork Botanical 

 Garden. 



