IOWA PTERIDOPHYTA. 169 



were growing in a shallow pool on an exposure of Sioux 

 Quartzite, and were all sterile. Several specimens are in 

 the herbarium. 



Order II. SALVINIACE/E Bartling, Ord. Nat., PI., 



p. 15 (1830). 



Genus AZOLLA Lam., Encyc. Bot. vol. I, p. 343 



(1783). 



AZOLI.A CAROUNIANA Willd. 



This interesting species was discovered by Mr. F. 

 Reppert in Muscatine slough, Muscatine county, and has 

 since been found in the lower portion of the slough in 

 Louisa county. It begins to fruit in August. The sterile 

 (young) fronds are green, the fertile red. The following 

 sets are in the herbarium: Muscatine county (F. Reppert, 

 Oct., 1895, many fertile); Louisa county (Aug., 1897, 

 mostly sterile; P. C. Myers., later in Aug., 1897, some 

 fertile). 



Class IV. LYCOPODINE^ Swartz, 



I.e. 



Order I. LYCOPODIACE/^ Mx., Fl. Bor. Am., vol. 

 II, p. 231 (1803).* 



Genus h Y C O P O D I U M Z., Sp. PL, vol. II, p. 1100, 



(1753). 



Lycopodium lucidulum Mx. 



One Iowa specimen only is in the herbarium. It was 

 *Michaux wrote Lycopodacece, evidently a mistake. 



