21 



Dakota, Arizona and California ; also in elevated 

 regions neatly throughout the world. The 

 form incisum Mett. is an incised form from 

 Colorado and Ontario. — Dryopteris Filix-mas 

 (L.); Aspidium Filix-mas (L.). 



108. Nephrodium Floridanum Hook. Florida Crested 



Fern. Not uncommon ; in wet shades. Florida, 

 southern Georgia and along the Gulf coast to 

 Texas. — Dryopteris Floridana (Hook.); Aspid- 

 ium Floridanum (Hook.). 



109. Nephrodium fragrans (L ). Fragrant Fern. 



Rare ; on dryish rocks. Maine to New York, 

 Wisconsin and far northward; also in Green- 

 land, northern Europe and Asia, Japan and the 

 Caucasus. The form aquilonare {Dryopteris 

 aquilonaris Maxon) is a large fruited form from 

 Alaska. — Dryopteris fragrans (L.); Aspidium 

 fragrans (L.). 



no. Nephrodhim Goldieanum (Hook.). Goldie's 

 Fern. Not common ; in wet woodlands. Can- 

 ada to North Carolina, Tennessee and Iowa. 

 The form celsum {Dryopteris Goldieana celsa 

 Palmer) with smaller fronds is reported from 

 the Dismal Swamp, Virginia. — Dryopteris Gold- 

 ieana (Hook.); Aspidium Goldieanum Hook. 



in. Nephrodhtm margmale (L.)- Marginal Shield 

 Fern; Wood Fern. Common or abundant; in 

 rocky woodlands. Nova Scotia to Georgia, 

 Alabama, Indian Territory and British Colum- 

 bia. — Dryopteris marginalis (L.); Aspidium 

 marginale (L.). 



The forms elegans Robinson, Traillae Lawson 

 and tripmnatifidum Clute are ecological forms 

 found with the type. 



112. Nephrodium molle Desv. Rare; in moist wood 



