FerRN Papers In RHODORA oo 
2. A considerable number of leaves, without petiole 
bases, and therefore unidentifiable on scale characters, 
were placed in the americana covers, presumably on in- 
dusial characters. The scale character, however, is too 
uncertain in this group to make it certain that one or 
more of these leaves might not be glandless and at the 
same time have dark scales. 
A further argument for keeping together dilatata and 
var. americana so-called is found in the fact that both 
are alpine or arctic forms, i. e., they require a cold climate. 
In Labrador and Greenland it is cold enough at sea level, 
but farther south in Europe and in America, dilatata 
finds suitable coolness only on mountains. This cer- 
tainly is not true of spinulosa although this form may 
also occur in cold as well as warmer regions. The inter 
grading’ so called between these two is explained by the 
fact that in the north dilatata is sometimes stunted and 
no larger than spinulosa, but the two forms are separable 
on other grounds despite that, and the reviewer believes 
that Prof. Fernald has identified as spinulosa some leaves 
which are unmistakably small dilatata. 
The second paper’ is also concerned with a plant which 
is part of a group to which the writer has given considera 
able study but in this case he does not find himself obliged 
to dissent. Botrychium angustisegmentum (Pease & 
Moore) Fernald is recognized as a species distinct from 
B. lanceolatum on the basis of spore and sporangium 
characters, different life zone, and generally slenderer 
character. 
It is a fact that in the case of practically all species 
of Botrychiwm recognized as common to Europe and 
America, the European plants are almost invariably 
thicker and fleshier. If similar forms occur in America 
they are usually found in the northern portion of the 
continent. A good illustration is found in the case of 
* Rhodora 17: 87, 88. Ap 1915. 
