1901] Kennedy & Collins, — Bryophytes of Mt. Katahdin. 179 
bunch of moss consisting of U/ota crispa, (L.) Brid., Ulota crispula, 
Bruch. and U/ota Ludwigii, ( Brid.) Brid, and if these common forest 
species are there, the others may be confidently expected. 
The Alpine region of Katahdin was very inadequately explored by 
us : its large area of tableland, and its many precipitous slopes and 
ledges would take more than one summer to investigate, and we 
may look for interesting discoveries in the future. The Tableland 
is an Alpine garden much larger than at Mt. Washington and of 
the same granitic rock formation; the dome of Mt. Washington 
is probably drier and the rainfall there has a less evident influ- 
ence on vegetation from sinking deeper in among the rocky 
boulders and running off sooner from the want of soil to retain it. 
Mt. Washington has passed the era of slides and falls of masses of 
rock, while Katahdin is yet subject to both these changes, and is 
therefore in a transition state as regards the permanence of its present 
flora or the advent of new species. In fact, to compare small things 
with great, the change in the moss flora at Blue Hill in the Metro- 
politan Park Reservation near Boston, as shown in the steep sides of 
certain new avenues laid out a few years ago and now covered with 
Pogonatum tenue, Michx., Leptotrichum pallidum, Hampe and Dicran- 
ella heteromalla, Schimp. shows that earth slides soon make a resting 
place for the spores of mosses, where a very wet or a very dry sea- 
son may make great changes in the abundance of the plants. 
As compared with Mt. Mansfield, Katahdin lacks that slightly cal- 
careous soil which gives a special character to the Green Mountain 
vegetation, and is shown in mosses by the presence of Gymnosto- 
mums, Barbulas, and Physcomitriums which with Blindia, Seligeria, 
and Diéstichium always seem to me to be planted in just a little limy 
dust. It is doubtful if these species will ever be found on Katahdin. 
Itis probable that the summits of Mansfield, 4396 feet high, and 
Katahdin, 5215 feet high, have a larger rainfall than Washington, 
6300 feet high; at least the experience of our party of botanists who 
have explored all three of the mountains would lead us to that con- 
clusion, 
List OF BRYOPHYTES COLLECTED IN THE BASINS AND 
ON THE UPPER SLOPES OF KATAHDIN. 
A single asterisk (*) indicates species or varieties hitherto unrecorded from 
Maine, and double asterisks (* *) indicate those hitherto unrecorded from New 
England. 
