- 3 8- 



fers : the lower pinnae are hastate, with a spur on each 

 side at base ; and instead of ending in a single long 

 pinna, the frond is pinnatifid to the summit. Nor is it so 

 strongly deltoid in shape. Habitat : Rocks at Griffin's 

 Corners, N. Y. (J. C. Buchheister). 



10. Var. semilaccrum Moore. On the European 

 continent this is ranked as a variety of the sub-species 

 serratum Willd., which is a form 35 centimeters long 

 and 16 centimeters wide. In this variety not only are 

 the edges of the pinnae serrate, but some of the pinnae 

 are irregularly cut into quite deep lobes. My largest 

 American frond of the variety is 30 centimeters long 

 by 8.5 centimeters wide. Habitat : Rocks, Griffin's Cor- 

 ners, N. Y. (J. C. Buchheister). 



11. Var. sinuatum Willd. This variety is about the 

 same size as the preceding and much resembles that. The 

 main difference is that the pinnae are beautifully sinuate 

 or waved on the edges instead of being deeply cut. It is 

 merely a difference of degree, the one being a form of 

 the other, but distinguished from each other by foreign 

 writers. Habitat: Griffin's Corners. N. Y. (J. C. Buch- 

 heister) : Lake Sunapee, N. H. (C. E. Waters). 



group in. 



12. Var. wiultffidum Moore. While this variety is 

 about the usual size and outline of vulgare, it is very 

 distinct from the species proper in having the rachis 

 forked about 5 centimeters below the summit with two 

 perfectly natural tips to the frond. Both of these tips 

 are liable to be fruited and the sori seem to be confined 

 to them, or occasionally to one or two pinnae below them. 

 The rhizome with its scales and rootlets is unusually large 

 for the size of the fern. Habitat : Rocks, Griffin's Cor- 

 ners, N. Y. (J. C. Buchheister). 



r3. Var. ramosum Moore. The peculiarity of this form 

 is that one or more of the regular pinnae is developed 

 into something like a separate frond which is divided 



