FERNS OF THE DistRIcT OF COLUMBIA 41 
The most interesting single feature of the local Coastal 
Plain area is the occurrence of the so-called magnolia 
bogs, well described by MecAtee. These are small, : 
open, gently sloping patches of white gravel underlaid 
by an impervious stratum of clay, their surface con- 
stantly irrigated by a thin sheet of water flowing from 
springs at the upper swampy border. Here are found 
a considerable number. of typical pine barren plants, 
and here or in the near vicinity such ‘‘coastal’’ species 
as Lygodium palmatum, Dryopteris simulata, Anchistea 
virginica, Lycopodium adpressum, and, at a_ single 
locality, L. carolinianum—plants practically restricted 
to acid-soil situations. Since many such bogs doubt- 
less await discovery, it is not unlikely that Lycopodium 
alopecuroides will be added eventually to the District 
ora. : 
Aside from the species mentioned above as prac- 
tically limited to the Piedmont or to the Coastal Plain, 
there are many which occur generally throughout the 
local area, apparently showing no decided soil pref- 
erence if exposure and drainage conditions are suitable. 
' These are discussed in the following notes, which list 
56 species, distributed among 25 genera. The list is 
not an unusually long one, but nevertheless is equal 
to that of many larger areas. 
The city of Washington has grown rapidly in recent 
years, trolley lines stretching out to numerous small 
suburbs and far beyond them. Many still unspoiled 
woodlands are thus to be found within the city limits, 
and the more distant collecting grounds also are reached 
very quickly and easily. Two of the lines extend to 
Great Falls on opposite sides of the river, and a third 
parallels the river to Cabin John. The Chesapeake 
and Ohio Canal skirts the river, also, on the Maryland 
side, all the way to Great Falls, affording the easiest 
possible access to that wild region. Because of its 
