WOOTON AND STANDLEY— FLORA OF NEW MEXICO. 19 



Sori with indusia. 



Sori dorsal, not marginal. 



Sori straight; fronds once pinnate; stipes 



dark-colored 7. Asplenium (p. 24). 



Sori more or less curved; fronds twice 



pinnate; stipes stramineous 8. Athyrium (p. 25). 



Sori marginal, covered by reflexed edges of the 

 pinnae. 

 Reflexed margin discontinuous, appearing 



as separate large indusia 3. Adiantum (p. 21). 



Reflexed margin continuous around each 



pinna. 



An inner indusium present, making 



the covering of the sori double; 



fronds large, 40 to 100 cm. 



long 4. Pteridium (p. 21). 



Inner indusium wanting, the covering 



of the sori single ; fronds in ours 



never over 30 cm. long. 



Pinnules minute, beadlike, hairy 



(except in C. wrighlii, 



which resembles the next 



genus), not coriaceous 5. Cheilanthes (p. 21). 



Pinnules larger, 3 mm. long or 

 more, glabrous (except in 

 P. aspera), coriaceous 6. Pellaea (p. 23). 



1. BOMMERIA Fourn. 



Rootstocks creeping; fronds 5-angled , pinnate, hispid above, tomentose beneath; 

 6ori oblong or linear, following the course of the veinlets, exindusiate. 



1. Bommeriahispida (Mett.) Underw. Bull. Torrey Club 29: 633. 1902. 



Gymnogramme hispida Mett.; Kuhn, Linnaea 36: 72. 1869. 



Gymnopteris hispida Underw. Native Ferns ed. 6. 84. 1900. 



Type locality: Western Texas. 



Range: Texas to New Mexico and Arizona. 



New Mexico: Bear Mountains; Organ Mountains; 5 miles east of San Lorenzo; 

 Mimbres River; Silver City; Florida Mountains. Dry hills, in the Upper Sonoran 

 Zone. 



2. NOTHOLAENA R. Br. Cloak fern. 



Sori marginal, at first round or oblong, soon confluent into a narrow naked band; 

 veins free; fronds various. 



Our species are of somewhat varied aspect, three of them (Eunotholaena) of distinct 

 form, one resembling a Bommeria, and two others such that they might pass for Pel- 

 laeas. Some of them are very common in the dry rocky foothills, while two of the 

 species are rare in our range. 



key to the species. 



Fronds covered more or less abundantly with scales or hairs, not 

 farinose, once pinnate. 

 Fronds densely woolly beneath, the wool at first white, 



becoming ferruginous 1 . N. bonariensis. 



Fronds scaly on both sides, the scales at first white, changing 

 to darker. 



