— 4 8— 



156. Pellaea ornithopus Hook. Bird-foot Fern. Com- 

 mon; in sterile half-shaded soil. California. 



157- Pellaea pulchella (M. & G.). Not common; at 

 the base of dryish rocks. Western Texas and 

 New Mexico; also southward to Peru. 



158. Pellaea ternifolia (Cav.). Not common; in crev- 



ices of rocks. Western Texas; also southward 

 to Chili, in Santo Domingo and the Hawaiian 

 Islands. 



159. Pellaea Wrightiana Hook. Common; in dry, 



sterile soil. Kansas to Texas and California. 

 The form compacta is found with the type, 

 which is quite variable. — P. mucronata D. C. 

 Eaton. 



Phegopteris Fee. 



160. Phegopteris alpestris (Hoppe). Alpine Polypody. 



Not common; on elevated rocky slopes. Mon- 

 tana and British Columbia to California; also 

 in Europe. — Athyrium alpestre (Hoppe). 



161. Phegopteris dry opteris (L.). Oak Fern. Tolera- 



bly common; in moist woodlands. Alaska to 

 Newfoundland, Virginia, Kansas, Colorado and 

 Oregon; also in Greenland, Europe, Northern 

 Asia, Japan and China. — Dry opt er is Linnceana 

 C. Chr. 



162. Phegopteris hexagonoptera (Michx.). Broad 



Beech Fern. Common; in shades, moist or 

 dry. New England to Quebec, Minnesota, 

 Kansas, Louisiana and Florida; also in India. 



163. Phegopteris polypodioides Fee. Long Beech 



Fern. Common; on wet rocks in sun or 

 shade. Alaska to Newfoundland, Virginia and 

 Iowa; also in Greenland, Europe, Northern 

 Asia, Japan and the Himalayas. — Dry opt er is 

 phegopteris (L ). 



