393 
root action excessive. The remedy would seem to be in provid- 
ing a cooler, dryer soil with increased light for the aerial parts, 
whenever possible. Byron D. Hatstep. 
Contributions to American Bryology, III. 
By. ELizABETH G. BRITTON. 
NOTES ON THE NORTH AMERICAN SPECIES OF 
anes .ORTHOTRICHUM. 
A. Those with superficial stomata. 
ORTHOTRICHUM OBTUSIFOLIUM, Schrad. Crypt. Gew. 14 (1796). 
Though, as its name implies, the leaves of this species are 
generally blunt, yet Austin collected specimens on trees in a 
swamp, at Jordansville, N. Y., on December 15, 1879, having the 
“leaves either obtuse, or acute or even apiculate on the same 
stem.” I have verified this statement, and also observed that the 
perichetial leaves are occasionally even acuminate, as seen on 
Specimens recently collected by me on the Pocono Mountain, 
Pennsylvania, the specimens being in fruit, and the leaves bearing 
the propagula and dense papilla, which are characteristics of this 
species, 
Although it generally grows on trees, especially poplars, and 
has been collected on elms along highways, and on old apple 
trees, yet Austin also gathered it on limestone fences, Sussex Co., 
N. J., and on stone walls, Herkimer Co., N. Y. These specimens 
are smaller and darker green than usual, for Canadian and Western 
Specimens as well as most European ones are often light yellow 
with stems 1-2cm.long. This species is probably more common 
in the Eastern States than is supposed, but on account of its de- 
Pauperate size and frequent sterility is seldom collected. 
OrtTHoTRICHUM sTRIATUM (L.) Hedw. 
O. leiocarpum, Br. & Sch. Br. Eu. t. 220 (1 837). 
Sullivant and Lesquereux distributed this species as number 
183, Musci Bor. Am., Ed. II., 1865, mixed with O. affine, presum- 
ably from two localities, as the label reads: Hab. in iisdem cum 
