292 



BRISTLE PEEN. 



Halleri, and all the lanceolate Aspleniums, remains unaltered 

 under any condition. Now the two Trichomanes, although less 



Andbews's Bristle Fern. 



Frond of Trichomanes radicans, vnr. Audrewsii, 

 {^natural size). 



decidedly deltoid or lanceolate than the ferns I have \ky\ 



cited, follow the same law, each preserving respec- 

 tively its deltoid or lanceolate tendency under cul- 

 tivation. 



Again, there is a decided difference, as far as I can learn from 

 my limited materials, in the involucres of the two plants. In 



