84 Rhodora [May 
season in Falmouth at the base of Cape Cod. Woodsia ilvensis, a 
plant of sunny, dry ledges, apparently avoids northwestern Maine 
and southeastern Massachusetts and is known from only a single 
station in Rhode Island. 
Group B is composed of strictly northern plants, confined, except 
for isolated stations on Mt. Greylock, to comparatively boreal hab- 
itats in the northern tier of states. Athyrium angustum, var. lauren- 
tianum was, when first described, known in our region only from 
extreme eastern Maine in Princeton. It has since been found at. 
three stations in northern Maine. Polystichum Braunii grows in 
ravines and deep woods, usually at an altitude of 1000 feet or more. 
It has been found on Mt. Greylock, Mass., at many places in the 
Vermont mountains and in northern New Hampshire, at Grafton, 
Strong, Temple and New Vineyard in western Maine and at scattered 
stations on the slopes of mountains in northern Maine. Thelypteris 
spinulosa, var. americana has almost the same range, but is much 
more abundant, as it is a typical plant of the spruce forest at an ele- 
vation of 1000 feet or more. It also reaches a splendid development 
in the spruce woods along the Maine coast from the islands of Penob- 
scot Bay eastward. 
SOUTHERN SPECIES. 
A 
Asplenium platyneuron Thelypteris cristata, var. Clin- 
s Trichomanes toniana 
Athyrium angustum, var. elatius be hexagonoptera 
^ simulata 
Woodsia obtusa 
B 
Asplenium montanum Athyrium asplenioides 
E pinnatifidum Cheilanthes lanosa 
Lygodium palmatum 
As in the case of the northern species, the southern divide into 
two groups. Group A comprises species of rather wide distribution 
in southern New England, which become rarer and occur mostly at 
low altitudes northward and, with the exception of Athyrium angus- 
tum, var. elatius, reach in that direction no further than south-central 
Maine. Asplenium platyneuron is well known southward, reaching 
