40 Karl M. Wiegand and Arthur J. Eames 



Newf. to Minn., southw. to N. C, Kv., and Idaho; occasional on the Coastal 

 Plain. 

 This may be a distinct species. (See Rhodora 13: 168. 1911.) 



7. L. tristachyum Pursh. Club-moss. 



Habitat similar to that of the last preceding species ; rare. Aug. 



Hilltops of Van Etten, Spencer, Danby, Caroline, and Newfield (A. J. E., K. M. 

 IV., L. H. MacDaniels, & L. F. Randolph) ; locally abundant in the s. e. corner of 

 Newfield and 1J4 miles n. of Caroline Center; woods along Beaver Brook and 

 McLean Bogs (IV. C. Muenscher). 



Newf. to Lake Superior, southw. to Del. and in the mts. to Ga. ; infrequent on the 

 Coastal Plain. Found also in Eu. 



8. SELAGINELLACEAE (Selaginella Family) 



1. Selaginella Beauv. 

 1. S. rupestris (L.) Spring. 



Dry exposed cliff crests, in noncalcareous sterile soils ; rare. Sept.-Oct. 



Taughannock Gorge, n. side above the falls (D. in C. U. Herb.!), still per- 

 sisting in this restricted area. 



N. S. and Ont. to the Pacific coast, southw. to Ga. and Mo., but apparently rare 

 on the coastal plain of N. E. Found also in Eurasia. 



[S. apoda (L.) Fernald. (See Rhodora 17:68. 1915.) 



Not yet found within the limits of this flora, but occurring on low grassy soils 

 over marl on the borders of Green Lake, Preble, Cortland Co.] 



9. ISOETACEAE (Quillwort Family) 

 1. Isoetes L. 



a. Megaspores with slender jagged spines ; low plants, usually submerged. 



1. /. echinospora, 



var. B rami ii 

 a. Megaspores alveolate ; plants taller, 1-4 dm. high, usually emersed. 



2. /. Engclmanni 



1. I. echinospora Dur., var. Braunii (Dur.) Engelm. Quillwort. 

 Sandy lake bottoms, in shallow waters ; rare. Julv-Sept. 



Cayuta Lake, w. shore (D. in C. U. Herb.) ; Duck Lake (K. M. IV., A. J. E., & 

 F. P. Metcalf). 



Newf. to B. C, southw. to Pa. and Calif., including the Atlantic Coastal Plain. 



2. I. Engelmanni A. Br. Quillwort. 



Marly mud, usually emersed but submerged in spring and during seasons of high 

 water ; rare. July-Sept. 



Small pocket along w. edge of Cortland marl pond region, also about a small pond 

 s. w. of Chicago Bog (D. in C. U. Herb.!) ; Lake Como (Locke Pond, D. in C. U. 

 Herb., 1881). 



N. H. and Vt. to Pa., 111., and Mo. ; rare or absent on the Coastal Plain. 



