56 THE FERN BULLETIN 



285. Isoetes Howellii Engelm. Not uncommon. 

 California to Idaho and Washington. — Isoetes 

 nuda Engelm.; Isoetes Underwoodii Henders. 



The form Piperi (A. A. Eaton) is reported 

 with the type. — Isoetes Piperi A. A. Eaton. 



286. Isoetes Macounii A. A. Eaton. Very rare. 

 Atka Island off the coast of Alaska. 



287. Isoetes macrospora Dur. Somewhat rare. New 

 Jersey, Lake Superior, Colorado and California 

 northward. The closely allied Isoetes lacustris 

 is common in Northern Europe. 



The form heterospora (A. A. Eaton). — /. 

 heterospora A. A. Eaton is reported from 

 Maine; f. paupercula Engelm. is reported 

 from Colorado and California. — Isoetes Occi- 

 dent alis Henders. 



288. Isoetes melanopoda, J. Gay. Common; in 

 wet weather lakes. Illinois, Iowa and Nebraska 

 to Texas and California. The form pallida 

 Engelm. is reported from Texas and f. Cali- 

 fornica A. A. Eaton, from California. 



289. Isoetes melanospora Engelm. Very rare. 

 Stone Mountain and vicinity, Georgia. 



200. Isoetes minima A. A. Eaton. Very rare. Damp 

 prairie near Waverly, Washington. Collected 

 but once. 



291. Isoetes Nuttallii A. Br. Rare; on the banks 

 of rivers and streams. California to British 

 Columbia and Idaho. 



292. Isoetes Orcutti A. A. Eaton. Rare ; in wet 

 weather pools. San Diego, California; also in 

 Lower California. 



