HOFFMANN: FLORA OF BERKSHIRE COUNTY. 199 



WOODSIA. 



W. ilvensis (L.) R. Br. Rusty Woodsia. — Exposed rocks; occa- 

 sional. Stockbridge ; West Stockbridge; Monterey; New Marlboro; 

 Mt. Washington; Sheffield. 



W. obtusa (Spreng.) Torr. Blunt-lobed Woodsia. — Exposed 

 rocks or shaded ledges, chiefly calcareous; occasional in the valley. 

 Cheshire (Winslow); Pittsfield; Stockbridge; New Marlboro; 

 Egremont (Walters); Sheffield. 



OSMUNDACEAE. FLOWERING FERN FAMILY. 

 OSMUNDA. Flowering Fern. 



O. cinnamomea L. Cinnamon Fern. — Low wet woods, borders 

 of swamps in the valley, and wet hillsides on the plateau, where it 

 reaches an altitude of 2100 feet (Florida); common. 



forma bipinnatifida Clute. — Swampy woods, Sandisfield. 



forma frondosa (T. & G.) Britton. — (var. frondosa Man. ed. 7.) 



Sheffield (Churchill). 



O. Claytoniana L. Interrupted Fern. — Moist woods and on 

 the plateau on ill-drained hillsides; common. 



O. regalis L., var. spectabilis (Willd.) Gray. Royal Fern. — 

 (0. regalis Man. ed. 7; vid. Rhodora, 21: 17G, 1919.) 



Borders of ponds, swamps and wet woods, reaching an altitude of 

 2000 feet (Savoy); frequent. 



OPHIOOLOSSAC'EAE. ADDER'S TONGUE FAMILY. 

 BOTRYCHIUM. Moonwort; Grape Fern. 



B. angustisegmentum (Pease & Moore) Fernald. — {B. lanceo- 

 latum, var. angvstispgmentum Man. cd. 7; vid. Rhodora, 17: 87, 1915; 

 B. lancrolatuu) 111. Fl. ed. 2.) 



Rich leaf mould, chiefly under deciduous trees, often with B. 

 ramosum; frequent. 



B. dissectum Spreng. — (B. obliquum, var. di-sscctiim Man. ed. 7.) 



Woods and pastiu'cs; frequent. 



forma elongatum (Gilbert & Haberer), comb. nov. — (B. 

 obliquum, var. elongatum Gilbert & Ilabi-rer, Fern Hull. 11: S9, 1903, 

 and Man. e<l. 7.) 



Pasture, Mt. Washington. 



