30 Tennessee Flora. 



PTERIDIUM Scop. 



Pteridium aquilinum (L.) Kiihn. Bracken fern. The larger 

 form in rich, moist woods. Cumberland and Alle.c^hany Mts. 



Ft. aquilinum pseudocaudatum (L.) Clute. A form common 

 in siliceous soils, and g-ravelly hill lands. O. S. July-Sep- 

 tember. 



PELL^A Link. 



Pellaea atropurpurea (L.) Link. Cliff brake. On exposed 

 situations on limestone banks and cliffs. O. S. June-Sep- 

 tember. 



CHEILANTHES Sw. 



Cheilanthes Alabamensis (Buckl.) Kuntze. Limestone 

 rocks ; frequent in E. and M. Tenn. July-September. 



Ch. lanosa Michx. Ch. vestita (Sw.) Watt. Bluffs on 

 Cumberland River, cedar glades under cedars, Mts. of East 

 Tennessee. June-September. 



Ch. tomentosa Link. Bluffs on Ocoee River. Fronds often 

 2 feet long. Also South Pittsburg. Cumberland Mts. 



POLYPODIUM L. 



Polypodium vulgare L. On rocks and on the ground, Cum- 

 berland and Alleghany Mts. Summer. M. 



P. polypodioides (L.) A. S. Hitchcock. P. incanum Sw. 

 Covering trunks of trees, on rocks, and on the ground. O. S. 

 June-October. 



SALVINIACE.^ Reichenb. 



AZOLLA Lam. 



Azolla Caroliniana Willd. On a weir or millpond, near 

 Riceville, McMinn County, and W. Tenn. cypress swamps. 

 July. 



EQUISETACE^ Michx. 



EQUISETUM L. 



Equisetum arvense L. Field horsetail. Moist fields, Cave 

 Spring, E. Tenn. 



E. robustum A. Br. Sandy banks of Mississippi River, 

 W. Tenn. 



E. hyemale L. Common scouring rush. Along Holston 

 River. J. K. Small. 



LYCOPODIACE^ Michx. 



LYCOPODIUM L. Club Moss. 



Lycopodium Selago L. Roane Mt. T. W. Chickering. 

 L. lucidulum Alichx. Sewanee. Rugbee. Mrs. M. S. Per- 

 cival. 



