66 
I have compared our specimens with the description of U. 
curvifolia given by Limpricht in the Laumboose p. 28, and find 
only one discrepancy, he says the cilia have only one row of cells, @ 
ours have two. Schimper figures U. curvifolia in the Bryologia — 
Europza with two, and the Manual states they have two. I have 
also compared the leaves with those of U. curvifolia, from Raben- — 
-horst’s Bryotheca Europea, Nos. 182 and 222, and with our é 
specimens they are identical. In this connection it will be re- — 
membered that the Manual says that U. curvifolia has been col — 
lected by Drummond in North America, credited by Schimper. — 
I sent to Kew to ask if Schimper’s specimens were numbered, but — 
they are not. In one of Drummond's sets at Kew, however, there: = 
is the same mixture of specimens as in our No. 153. ; 
I have appealed to Mr. Mitten twice to reconsider this ques 
tion, and sent him a portion of our specimen of Drummond's No. 
153, but he has not done so. Therefore we must reason the 
question out for ourselves. Mitten says in his original description 
that U. Americana “ differs from U. curvifolia, Wahl., in the areola- 
tion of the base of the leaf and from U. crispa and U. crispula in 
the same particular, as well as in the form of the base of the 
leaves.” Now evidently the first comparison was with the species 
to which he considered it most closely allied, the second with the 
species with which the specimens were mixed and confused it 
distribution. It is to the latter group, however, that LesquereU* 
and James in the Manual referred it, as in their set they had only 
a tree species, allied to U. crispa. : 
Macoun’s set also has only U. crispa. Of course it is possi 
that Mitten did find a different species mixed in his 153, from the 
ones which I have found in our set and Hooker’s set at Kew, but 
it will be remembered that it has not been collected sit 
Whereas U. curvifolia has been collected on the shore of Laké 
Huron by Macoun, and one of the localities given by Mitten f 
U. Americana, is Lake Huron collected by Todd. : 
The original description reads as follows: 
“ Ulota Americana, Monoica, foliis siccitate tortis appressis 
basi subovali longe lanceolatis sensim acutis nervo carinatis 1 
ginibus recurvis, saepe suberosis, cellulis basi ad margines sefi¢ 
circiter hyalinis oblongis, in media angustis luteis, e superiot! 
rotundatis diametro circiter z755 unciae metientibus perichae 
