THE FERN BULLETIN 



77 



Polypodium vulgare (L.) Polypody. Rocks. 

 Common. 



Polypodium vulgare /. marginale. Gilbert. 

 Named from material collected in Lancaster county by 

 Waters. Since gathered by the writer in Delaware 

 county. 



Polypodium vulgare var. rotundatum. Milde. 

 Reported in Gilbert's Monograph (Fern Bulletin, 

 April, 1906) as having been found in Lancaster 

 county. 



Polypodium vulgare var. Alato-multifidum. 

 Gilbert. Type collected by Edw. R. Heacock near 

 Maunch Chunk, Carbon county, growing on red sand- 

 stone. 



Polystichum acrostichoides (Michx.) Christ- 

 mas Fern. Rocky woods. Common. 



Polystichum acrostichoides incisum Gray. To 

 be expected with the species. I have found it in situa- 

 tions that had apparently not been disturbed for years. 

 (P. A. Schweimtzii (Beck) Small.) 



Polystichum acrostichoides crispum. Clute. 

 With the type reported from Allegheny county and no 

 doubt occurs elsewhere. 



Polytichum Braunii (Spenner.) Braun's Holly 

 Fern. Very rare. Finds its southern limit in Lycom- 

 ing and Sullivan counties in northern part of the State. 



Pteris aquilina (L.) Bracken. In field, wood 

 and swamp. Everywhere. (Pteridium aquilinum 

 (L.) Kuhn. 



Pteris aquilina pseudocaudata. Clute. Sandy 

 wastes. Tinicune in Delaware county in the extreme 

 southeastern corner of State which presents conditions 

 similar to those in southern New Jersey where I find 

 this form abundant. 



