44 AMERICAN FERN JOURNAL 
ANCHISTEA virGINicaA (L.) Prest. Swamps; infre- 
quent, the known localities all in the Coastal Plain. 
LORINSERIA AREOLATA (L.) Prest. Swamps and 
other low, permanently moist, shaded situations; not 
uncommon, but nearly restricted to the Coastal Plain. 
Late summer. 
CaMPTOSORUS RHIZOPHYLLUS (L.) Link. Shaded, 
mossy rocks in cool situations; a few localities along the 3 
Potomac, principally above Cabin John. 
ASPLENIUM PINNATIFIDUM Nutt. Crevices and earth : 
pockets of shaded clifis; Virginia shore of the Potomac : 
several miles below Great Falls; very rare. E 
ASPLENIUM EBENOIDES R. R. Scorr. Crevices of 
shaded rocks; two records, Plummers Island and Vir- 
ginia shore of the Potomac near Little Falls. 
ASPLENIUM PLATYNEURON (L.) OaAkeEs. Grassy OF ~ — 
rocky banks and thinly shaded situations generally; 
abundant. 
AsPLENIUM TricHoMANEs L. Crevices of cool, shaded 
cliffs and on mossy rocks; upper Potomac region chiefly; a 
infrequent. 
ASPLENIUM MONTANUM Witip. Crevices of dryish ; 
rocks; a single station, above Great Falls on the Vir- q 
ginia side of river. 
graph and with the plant ranging poeple through New England and 
an Appalachian region generally, ther nm be B no reasonable doubt as 
*s name in gee sense. 
The related lowland plant occupying the Pa eg of the Piedmont 
region from Long Island along the Coastal Plain ¢ © Florida and the Gulf 
egion (where it alone occurs), and extending some distance up the lower 
Mississippi Valley, while for the most part recognizable as different — 
d an P. latiusculum, is highly problematical. It 
described as Pteris aquilina pseudocaudata Clute (Fern Bull. 8: 39 
1900), t fr bylon, Long Isl P eld y 
and the collection of further terial it ms b r ‘i 
subspecies only: Pteridium latiusculum pseudocaudatum (Clute) 
axon. ; 
ants of western North America also are very difficult of of classi- 
y, as it see 
en i A 
conditions. They fall into several variable categories, none of which 15 
pr 
ecisely identical with the European plant, though they are for the most 
part more nearly related to that than to P. latiusculum ; 
