HOFFMANN: FLORA OF BERKSHIRE COUNTY. 195 



var. elatius (Link) Butters.— (Vid. Rhodora, 19: 191, 1917.) 

 Dry woods, thickets and clearings; frequent in the southern part of 

 the valley. 



var. rubellum (Gilbert) Butters. — ( Vid. Rhodora, 19: 193, 1917.) 

 Rich woods and swamps; common. 



CAMPTOSORUS. Walking Leaf. 



C. rhizophyllus (L.) Link. Walking Leaf; Walking Fern. — 

 On limestone, chiefly in shade; frequent in the valley. Becket (C. S. 

 Lewis) . 



forma auriculatus, f. nov. — Auriculis elongatis. Auricles 

 elongated, sometimes rooting. 



Limestone ledge. New Marlboro. 



CRYPTOGRAMMA. Rock Brake. 



C. Stelleri (Gmel.) Prantl. Slender Rock Brake. — On shaded 

 limestone cliffs, Bullock's Ledge, W^illiamstown. 



CYSTOPTERIS. Bladder P^erx. 

 (Filix 111. Fl. cd. 2.) 



C. bulbifera (L.) Bernh. Bulb-bearing Fern. — Wet banks and 

 moist rocks, chiefly in shade, generally but not always in calcareous 

 soil; frequent in the valley and on the slopes of Greylock and of The 

 Dome, but rarer on the plateau. Washington and Becket (C. S. 

 Lewis). 



C. fragilis (L.) Bernh. Fragile Bladder Fern. — Shaded cliffs, 

 moist banks and rocky wooded hillsides; frequent. 



DENNSTAEDTIA. 



(DicUonia Man. od. 7; rid. Rhodora, 21: 175, 1919.) 



D. punctilobula (Michx.) Moore. Hay-scented Fern. — Dry 

 woods and upland hillsides; common. When growing in shade near 

 an opening, this fern turns the face of the frond, that is the side that 

 does not bear the spores, to_tho light. 



ONOCLEA. 



O. sensibilis L. Shnsitivk Fkii.n. - Wet iiu adows, swampy 

 thickets and wet woodland; common. 



