Adiantum 



POLYPODIACEAE 



57 



Cannelton, on the top of low, rocky ledges about 8 miles east of Cannelton, 

 and in the shade on a low cliff in the woods of Wm. Stahl about 3 miles 

 south of Mt. Pleasant. The plants were numerous here but were small 

 (mostly less than 2 dm high) because they grew in the shade. 

 Conn, to Kans., southw. to Ga. and Tex. 



14. ADIANTUM [Tourn.] L. 



1. Adiantum pedatum L. Maidenhair Fern. Map 38. Infrequent to 

 frequent throughout the state in deep humus in many kinds of soils and 

 with many kinds of associates. It prefers shade and shelter from wind, 

 hence it is most often found in protected places. 



Newf. to Alaska, southw. to Ga., La., and Kans., and locally westward 

 to Utah and Calif. ; also in Asia. 



15. PTERlDIUM Scop. 



1. Pteridium latiusculum* (Desv.) Hieronymus. (Pteris aquilina of 

 Gray, Man., ed. 7, not L. and Pteridium aquilinum of Britton and Brown, 

 Illus. Flora, ed. 2, not Kuhn.) Bracken. Map 39. Infrequent but locally 

 common throughout the lake area in dry, sandy soil or in dry prairie habi- 

 tats. It is found also locally in a few of the southern counties on wooded 

 sandstone ridges. 



Newf. to Wis., and Wyo., southw. to D. C, W. Va., 111., and Ariz. 



16. POLYP6DIUM [Tourn] L. 



Blades of fronds glabrous, green 1. P. virginianum,. 



Blades of fronds densely scaly beneath, grayish. 2. P. polypodioides var. Michauxianum. 



1. Polypoium virginianum L. (Rhodora 24: 125. 1922.) (Polypodium 

 vulgare of American authors, not L.) Common Polypody. Map 40. 

 Local on the ledges of rocks in the area of the state where outcrops of 



* Variety pseudocaudatum (Clute) Maxon is now known from Crawford and Knox 

 Counties. 



