24 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Aspidium spinulosum (O. F. Miiller) Sw., var. dilatatum 

 (Hoffm.) Gray (dilated). 

 Dryopteris spinulosa Kuntze, var. dilatata Underw. 

 Broad Shield Fern. 



This variety is not known in its typical state in Connecti- 

 cut. The forma anadenium Robinson (without glands) ap- 

 parently occurs at East Hartford (Weatherby), Granby and 

 Barkhamsted (I. Holcomb), and Southington (Andrews, Bis- 

 sell). It is found growing with the species or with the var. 

 intermedium and none of the Connecticut specimens are as 

 characteristic as those from mountainous districts farther 

 north. July. 



CYSTOPTERIS Bernh. Bladder Fern. 

 Cystopteris bulbifera (L.) Bernh. (bulb-bearing). 



Filix bulbifera Underw. 

 Bladder Fern. 



Moist rocky woods, wet ledges, meadows and banks of 

 streams. Not reported on the coast or from the eastern and 

 southwestern parts of the state. Rare or local in central dis- 

 tricts : Guilford, at North Guilford (G. H. Bartlett), Windsor 

 (H. S. Clark), Simsbury (I Holcomb), Oxford (Harger). 

 Becoming frequent or common in northwestern Connecticut. 



July. 



Cystopteris fragilis (L.) Bernh. (brittle). 

 Filix fragilis Underw. 



Occasional to frequent. Rich woods, usually in leaf-mold 

 among rocks, sometimes found in old wells. June. 



One of the earliest of our ferns to appear in the spring. 



WOODSIA R. Br. 

 Woodsia ilvensis (L.) R. Br. (pertaining to the island Elba). 

 Rusty or Rock Woodsia. 



Dry exposed ledges of various rock formations. Rare or 

 local but found in nearly all parts of the state. July. 



Woodsia obtusa (Spreng.) Torr. (blunt). 

 Blunt Woodsia. 



Occasional. Woods or half-shade, usually in rocky, rather 

 dry places. July. 



