—in- 

 western form rather more fleshy than that of the East. Grows 

 in geyser formations which may account for the difference in its 

 appearance. 



B. t. obliquum forma occidEntale (B. occidcntalc Unde.). 

 Closely related to the preceding, and, in my opinion, a phase of it. 

 Both good representatives of the western form. 



B. ternatum Oxeidexse (B. tcrnatum var. Oneidense Gil- 

 bert). This, the most strongly marked of the forms in the At- 

 lantic States failed to receive a place in the recently published in- 

 dex to the described species of Botrychium. It can be distin- 

 guished at a glance in field or herbarium by its broad and slightly 

 divided pinnules, and is very common in central New York. 

 The fronds, notwithstanding their broad pinnules, are among the 

 smallest of the group. If any of our forms of Botrychium are 

 entitled to sub-specific rank, this is certainly the one. 



B. terxatum silaifolium (B. silaifolium Presl.). This is 

 also mainly a western form. To it. however. I would refer the 

 plant recently described by Mr. Gilbert as B. obliquum Habcreri 

 from central New York. I have examined the type specimen 

 and in my opinion it agrees perfectly with specimens of silai- 

 folium from California identified by Dr. Underwood. Even the 

 striations produced in the pinnae by drying appear identical. I 

 should call this a sub-species, as it does not approach the type as 

 closely as the others. 



So little is known about B. bitcrnatum Unde. and B. tcnuifo- 

 lium Unde. that I shall not attempt to place them. Judging from 

 what I have seen of the latter, and I have seen numerous plants 

 in the field. I should consider it a form of obliquum and I sus- 

 pect that bitcrnatum will prove to be based upon aberrant plants 

 of this which have fruited in spring instead of autumn. In regard 

 to this. Mr. \Y. \Y. Ashe has recently informed me that many 

 spring-flowering southern plants do not flower in the North 

 until late summer. It is possible our ferns may have similar 

 changes in their fruiting season. 



