1910] Nichols,— Notes on Connecticut Mosses 151 
RECENT ADDITIONS. 
PHYSCOMITRIUM IMMERSUM Sull. Three stations for this interesting 
North American species were found during the autumn of 1909, viz.— 
Hartford (Evans), Wethersfield (Miss Lorenz), and Portland (G. E. 
NJ. In all three localities the plants grew on damp sand or clay in 
places which are usually flooded during the spring by the water of the 
Connecticut river. Although not heretofore reported from New 
England it is probable that P. immersum is not uncommon here, at 
least in the valley of the Connecticut river. Outside of New England 
it has been found as far north as Quebec ! and ranges south and west 
to Delaware and Colorado respectively. This species is frequently 
confused with Aphanorrhegma serratum (Hook. & Wils.) Sull., to 
which it bears a close resemblance. Even in the field, however, the 
two may be separated from one another with reasonable certainty, 
P. immersum being somewhat more robust than the Aphanorrhegma, 
and where abundant occurring in lax tufts which are quite different 
from the more or less depressed tufts of Aphanorrhegma. Moreover, 
as pointed out by Mrs. E. G. Britton,’ in Aphanorrhegma the capsule 
splits exactly in the middle and the cells of the capsule-wall possess 
pronounced collenchymatous thickenings at their angles, while in 
P. immersum the line of dehiscence is invariably situated above the 
middle of the capsule and the cells of the capsule-wall are relatively 
thin-walled throughout. 
AULACOMNIUM ANDROGYNUM (L.) Schw. This species has been 
colleeted in New York (Miss Marshall), Maine (J. F. Collins), and 
Massachusetts (C. E. Faxon, and others), but the writer has been 
unable to find references to its occurrence in other eastern states. The 
Connecticut station is in the town of Branford (G. E. N., 1909), 
where the plants grow in considerable abundance in crevices of gneis- 
soid ledges at the border of a salt marsh. A. androgynum apparently 
does not fruit in eastern North America, but it may readily be dis- 
tinguished from other species of Aulacomnium by its peculiar organs 
of vegetative reproduction. These consist of fusiform, multicellular 
gemmae borne on short stalks and produced in great numbers at the 
tips of slender pseudopodia. The densely crowded masses of gemmae 
1 Macoun, J., Cat. Can, Plants. 6:120. 1892. 
2 Bull. Torr. Bot. Club. 21:190, 191. 1894. 
