82 



THE FERN BULLETIN 



ties and should occur elsewhere together with other 

 ecological forms. 



Equisetum variegatum (Schleich.) Variegated 

 Scouring Rush. Rare. Reported from Erie county in 

 the extreme northern corner. 



ISOETACEAE 



Isoetes Dodgeii (A. A. Eaton.) Dodge's Quill- 

 wort. Gravelly flats. Rare. On Delaware river shore 

 in Bucks county, Lehigh river at Bethlehem, and in 

 York and Bradford counties. Xot recorded south of 

 Pennsylvania. 



Isoetes echixospora Brauxii (Englm.) Braun's 

 Ouillwort. Local. In lakes of the northern moun- 

 tain district and probably elsewhere. Wayne, Lacka- 

 wanna, Carbon Crawford and Erie counties. 



Isoetes echixospora robust a (Englm.) Rare. 

 Recorded from Bucks county. 



Isoetes Engelmannii (A. Br.) Englemann's 

 Ouillwort. Local. In lakes and streams. Monroe, 

 Lehigh, Bucks. Delaware, Wayne, Lancaster, Sus- 

 quehanna and Philadelphia counties. 



Isoetes Englemannii fontana (A. A. Eaton.) 

 In spring water a few inches deep at McCall's Ferry, 

 Lancaster county. Type station. 



Isoetes Engelmannii gracilis (Englm.) Rare. 

 Delaware and Buck counties and should occur else- 

 where with the type. 



Isoettes valida (Englm.) Rare. Type locality in 

 Lancaster county. Lebanon and Huntingdon counties. 



Isoetes lacustris (L.) Lake Ouillwort. Cred- 

 ited to Delaware county in The Flora of Philadelphia 

 and vicinity (Keller and Brown). This was considered 

 by Mr. Eaton as "Surely a mistake." 



