PTERIDOPHYTA. 3 



Aspidium Sw. Shield Fern. Wood Fern. 



Thelypteris (L.) Sw. Common in moist woods. 



simulatum Davenport. Massachusetts Fern. 



Worcester, Holden. 



noveboracense (L.) Sw. New York Fern. 



Common in rich woods, 

 marginale (L.) Sw. 



Very common in woods and shaded places. 



To see, under a compound microscope, the ripe sporanges spring 

 backward and scatter the spores is a sight granted to comparatively 

 few persons, but to those elect few it is "a joy forever." 



Goldianum Hook. Goldie's Fern. 



Spencer. Miss A. E. Tucker. 

 Boottii Tuckerm. Boott's Shield Fern. 



Hardwick. Miss Grace E. Baker, 

 cristatum (L.) Sw. Crested Shield Fern. 

 Along brooks through woodlands, and on the margins 



of swamps. 

 cristatum, var. Clintonianum. D. C. Eaton. 



In similar situations with the preceding. 

 spinulosum (O. F. Miiller) Sw. 



In rich woods, common, 

 spinulosum, var. intermedium (Muhl.) D. C. Eaton. 



In woods, common. 



Cystopteris Bernh. Bladder Fern, 

 fragilis (L.) Bernh. 



I have found it sparingly in Worcester and in Brookfield. In the 

 latter town it was growing on a rocky, wooded hillside with the 

 small Aspleniums and Clematis verticillaris, a combination worth 

 traveling miles to see. 



