20 



THE FERN BULLETIN 



American forms are described : Capillare, pau- 

 ciramosum praecox, pyramidale, robustum. 

 serotinum, and squarrosum. All are mere eco 

 ' logical phases of the plant. 



234. Equisetum telmateia Ehrh. Ivory Horsetail. 



Common; in moist places. California to 

 Alaska mostly near the coast ; also from Ireland 

 and Scotland to Siberia, Persia and North 

 Africa. 



235. Equisetum variegatum Schleich. Variegated 



Scouring Rush. Not uncommon ; in moist 

 places. From beyond the Arctic Circle south- 

 ward to the northern tier of States and Illinois 

 and Indiana ; also in the old world north of the 

 forty-second degree of latitude. The form 

 AlaskanumA. A. Eaton has been reported 

 from Alaska. 



LYCOPODIACEAE. 



236. Lycopodium alopecuroides L. Fox Tail Club- 



Moss. Not uncommon ; in wet grounds. Long- 

 Island to Texas, mostly near the coast; also 

 southward to Monte Video. 



237. Lycopodium alopecuroides adpressum Chapnu 



Common ; in sandy swamps. Massachusetts to 

 Texas — the common form. The variety poly- 

 clavatum McDonald with several heads on a 

 stem is reported from Staten Island, New York. 

 — Lycopodium alopecuroides Chapmani (Un- 

 done.) Lycopodium adpressum (Capm.) 



238. Lycopodium alopecuroides pinnatum Chapm. 



Not uncommon; in wet grounds. Georgia and 



