—47— 



rocks in sun or shade. Western Texas and 

 New Mexico. The form compacta Clute is a 

 form with close-set pinnules found with the 

 type. 



147. Pellaea atropurpurea (L ). Purple-stemmed Cliff- 



brake. Common or abundant: on calcareous 

 rocks. Vermont. Ontario and British Colum- 

 bia to Georgia, Arizona and California; also 

 in Mexico. The form cristata Trelease is a 

 crested form from Nevada. 



148. Pellaea brachyptera (Moore). Not uncommon; 



on rocks. California and Oregon. 



149. Pellaea Breweri D. C. Eaton. Rare; on exposed 



rocks. Montana to Arizona, California and 

 Oregon. 



150. Pellaea Bridgesii (Hook.). Very rare; on exposed 



rocks at high altitudes. California. 



151. Pellaea densa (Brack.). Common; in the crevices 



of rocks. British Columbia to Montana, 

 Wyoming, Utah and California, and on Mt. 

 Albert, Quebec, and in Grey county, Ontario; 

 also southward to Costa Rica. 



152. Pellaea flexuosa (Kaulf.). Not uncommon on 



shaded rocks or in thickets. Western Texas 

 and New Mexico; also from Mexico to Peru 

 and in Santo Domingo. 



153. Pellaea intermedia Mett. Tolerably common ; at 



the base of dryish rocks. Texas and Arizona. 



154- Pellaea margmata (H. B. K.). Rare; in crevices 



of rocks. Huachuca Mountains, Arizona; also 

 southward to Chili. — Cheilanthes marginata 

 . H. B. K. 



155- Pellaea occidentals (E. Nelson). Not uncommon; 



in crevices of rocks. South Dakota to Wyom- 

 ing and Washington. 



