—ii 9 — 



36. Cheilanthes vestita Sw. Rather common ; on gneiss 

 rocks. Connecticut to Missouri, Georgia and 

 Texas, more common in the south. — C lanosa 

 (Michx.). 



87. Cheilanthes viscida Dav. Not common; in dry soil 



in shade. California. 



88. Cheilanthes Wrightii Hook. Somewhat rare; on 



open grassy knolls. Western Texas, Arizona 

 and New Mexico. 



Cryptogramma R. Br. 



S9. Cryptogramma acrostichoides R. Br. Rock Brake; 

 Parsley Fern; Pea Fern. Not uncommon; on 

 dryish cliffs and talus slopes. Labrador, north 

 shore of Lake Huron, Colorado and California 

 to the Arctic Circle. A closely allied species, of 

 which this is often considered a variety, is com- 

 mon in northern Europe and Asia. The form 

 foveolata Ruprecht is reported from British 

 Columbia and Alaska. 



90. Cryptogramma gracilis (Michx.). Slender Cliff- 



brake. Common; on moist limestone cliffs, 

 rarely found elsewhere. Pennsylvania, Illinois, 

 Iowa and Colorado northward; also in northern 

 Asia. This species is as well placed in the genus 

 Pellcza as here. The dimorphic fronds are re- 

 garded as characteristic of Cryptogramma — 

 Cryptogramme Stclleri (Gmel.); Pellcea gracilis 

 (Michx.). 



Cystopteris Bernh. 



91. Cystopteris bulbif era (L.). Bladder Fern. Abun- 



dant; on moist, shaded rocks, especially lime- 

 stone. Georgia and Arkansas to Canada. — Filix 

 bulbif era (L.). 



