42 AMERICAN FERN JOURNAL 
attractiveness, the upper Potomac gorge and adjacent 
bluffs have not unnaturally been explored more com- 
pletely than other local regions; but the entire territory 
of the “ District flora” is of very great interest, whether 
to the resident or visiting botanist, and will richly 
repay field study for many a year to come. 
OPHIOGLOSSACEAE 
OPHIOGLOSSUM vULGATUM L. Low moist woods or 
partially shaded, grassy slopes; nowhere common, though 
found at numerous localities. Just outside our area, 
at Chesapeake Beach, it occurs in great abundance, 
however. 
BoTRYCHIUM VIRGINIANUM (L.) Swartz. Abundant; 
best developed in rich hilly woods on the Virginia side 
of the upper Potomac. First of June. 
Borrycuium opLticuum Muuau. Low, brushy pas- 
tures and moist, thin woods; common. 
BorTrYcHIUM DISsECTUM SprENG. Moist woods and 
thickets; common, but decidedly less so than B. ob- 
liquum. 
(Botrychium neglectum Wood has been reported, prob- | 
ably in error 
OSMUNDACEAE 
OsmuNDA REGALIS L. Swamp borders and boggy or 
wet sandy woods; not uncommon, but as a rule lack- 
ing the vigorous appearance and large size of more 
northern plants. 
OSMUNDA CINNAMOMEA L. Wet weds: swamps, and 
low, partially cleared areas; abundant. 
- OSMUNDA CLAYTONIANA L. Swamp edges, moist 
wooded slopes, or sandy alluvial soil; not very com- 
mon, but found throughout. 
SCHIZAEACEAE 
Lycoprum Patmatum (BERNH,) Swartz. Wet “cat- 
brier’”’ thickets and borders of low woods; several re- 
ee ee 
