70 CRYPTOGRAMMA 



ROCK BRAKE: Crypto gramma acrostichoides. 



Sterile and fertile fronds dissimilar, 6 to 8, inches 

 high; sterile fronds twice to three times pinnate, 

 pinnae deeply cut into lobed and toothed, rounded 

 pinnules; fertile fronds three times pinnate, with 

 long, narrow, pod-like divisions, the edges of which 

 roll back to the midrib, and later spread out nearly 

 flat. 



Fruit dots borne near the margins of the divi- 

 sions. 



Found growing in clumps in the crevices of rocks 

 from Lake Huron, Lake Superior, Colorado and 

 California, to the Arctic regions. 



NOTES. 



