434 PTERIDOPHYTES (FERN PLANTS) 
Ferns are propagated vegetatively in greenhouses, and out of doors, 
where conditions are usually unfavorable for the development of 
their delicate gametophytes, many Ferns propagate almost en- 
Fic. 388. — A Moonwort (Botrychium Virginianum). X about ' 
tirely vegetatively. Some propagate by runners, many by the 
branching and segmenting of the rhizome, some by buds which 
fall from the leaves to the ground where they develop new plants, 
and some by the leaves bending over and taking root at their tips. 
ne 
