30 Tennessee Flora. 



PTERIDiUM Scop. 



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

 form in rich, moist woods, Cumberland and Alleghany Mts. 



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

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

 tember. 



PELL.ffiA 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. pol3rpodioides (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. 



AzoUa 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 Michx. Sewanee. Rugbee. Mrs. M. S. Per- 

 cival. 



