ee AMERICAN FERN JOURNAL 
ship of the plant as compared with closely related 
pants. 
One illustration suggests itself for consideration at this 
point. Numerous unsuccessful attempts were made 
recently to cross Dryopteris noveboracensis (L.) Gray with 
D. thelypteris (L.) Gray, and as a result doubt was cast 
on the existence of fern hybrids in nature.* These ex- 
_ periments go far toward showing how great is the difficulty 
attending the attempt to produce hybrids among ferns 
artificially or experimentally. On the other hand, the 
_ fact that Dr. Hoyt did not succeed in crossing two species — 
from which hybrid plants have been actually produced 
experimentally, by Miss Margaret Slosson,j rather de-— 
_ tracts from the value of his experiments as a basis for 
ae rma conclusions. A little more field study might 
es 
Spec -e of of which the hybrids have been found con 
_ produced | in nature, and even 
