i 
1907] Flora of the Boston District,— I 85 
ooo 
WOODSIA. 
ilvensis (L.) R. Br. Exposed dry ledges, occasional. 
obtusa (Spreng.) Torr. Shaded ledges; scattered stations through- 
out. 
DICKSONIA. 
. Ipunctilobula (Michx.) Gray. (D. pilosiuscula Willd.) Moist soil 
in open places and light shade; common. 
ONOCLEA. 
. sensibilis L. Damp woods and meadows, abundant. 
. Struthiopteris (L.) Hoffm. Moist soil, usually in shade; rare; 
not reported south of Boston. 
LYGODIUM. 
. palmatum (Bernh.) Sw. Low thickets, rare. Carlisle, Concord, 
Dover (1883, 1884), Saugus (1885), Newton; the last three 
stations probably extinct. 
OSMUNDA. 
. regalis L. *Swamps, wet woods, and lake shores; common. 
. Claytoniana L. Somewhat less common than the following species. 
. cinnamomea L. Swamps and low woods, common. The formal 
var. FRONDOSA Gray is occasionally found with the typical form. 
OPHIOGLOSSACEAE. 
OPHIOGLOSSUM. 
. vulgatum L. Moist fields and pastures, local. 
BOTRYCHIUM. 
. simplex E. Hitchcock. Low woods; Amesbury, Byfield, Easton, 
Salisbury, W. Newbury. 
. lanceolatum (Gmel. Angstr., var. angustisegmentum Pease & 
Moore. Low woods, rare; stations occasionally large. See 
Rhodora, viii. 229. 
. ramosum (Roth) Aschers. (B. matricariaejolium A. Br.) Low 
woods; Amesbury, Dedham, Natick, Needham, Salisbury, W. 
Newbury. 
