63 
LIN and Biair, Porter; CoLumBiA, Heller ; SOMERSET, 
Brown and Saunders ; BEAVER and ALLEGHENY, Shafer , 
ERIE, Fenno. 
Polypodium L. 
P. vulgare L.—On rocks. NorTHamprton, Easton, Porter ; 
Bucks, Moyer; DELAWARE, Jahn, CHESTER (Flora Cestrica); 
PIKE and MonrRoE, Porter; LUZERNE, Heller; LANCASTER, 
FRANKLIN and HuntTincpon, forter ; SOMERSET, Brown 
and Saunders ; BEAVER and ALLEHENY, Shafer, ERIE, 
Fenno. 
EQUISETALES. 
EQUISETACEAE. 
Equisetum L. 
E. arvense L.—In sandy soil. Monrok; NORTHAMPTON ; 
Bucks; PHILADELPHIA; DELAWARE; CHESTER; LAN- 
CASTER ; FRANKLIN and HUNTINGDON, Porter; ALLE- 
GHENY, Houston; VENANGO, Kroui; ERIE, Fenno. 
E. fluviatile L.—In swamps and along the borders of ponds. 
TioGca, Garber ; LUZERNE, Heller; LEHIGH, Rau ; Mon. 
ROE and NorTHAMPTON, Porter; Bucks, Tullytown, 
Fretz; ERIE, Fenno. 
E. hyemale L.—In wet places and on banks, especially along 
rivers and lakes. NORTHAMPTON and Bucks, Porter; 
DELAWARE, CHESTER ; LANCASTER; ERIE, Fenno. 
E. laevigatum A. Br.—Along streams and rivers, especially 
in clay soil. NORTHAMPTON, Easton, along the Delaware, 
Porter. 
E. littorale Kuehl.—On sandy river and lake shores. NoRTH- 
AMPTON, Easton, Porter ; Bucks, Point Pleasant, Frezz , 
DELAWARE, Palmer; LANCASTER, YORK and DAUPHIN, 
on the Susquehanna, Porter. 
E. pratense Ehrh.—In sandy places. CLEARFIELD, McMinn. 
