102 Rhodora [JUNE 
Ridge, and elsewhere. Finally, a more extended trip was made south 
from Beavermouth to the headwaters of Quartz Creek, with a side 
trip to Fish Lake. 
In all, some seventy collections were brought away, half from 
alpine situations and half from lower levels. The number and size of 
the collections were limited by several factors. The party was carry- 
ing its equipment and provisions, and (except at Glacier) was as often 
as not without any trail to follow, and this with persistent rainy 
weather made it necessary to minimize the weight of fluid collections 
for transport. Toward the end of the trip—after the tenth of Sep- 
tember—there was considerable snow and the exceedingly low tem- 
peratures froze up the alpine pools and thickly coated the more 
exposed stones in the streams with ice, precluding further operations 
in the region where the most effective collecting could have been 
done. A small part of the material was dried in masses on paper, 
which was very satisfactory for many of the Myxophyceae. Other 
lots were preserved in weak formalin or with iodine, which last was 
very good for many of the Conjugales, though poor for Myxophyceac. 
As each collection included several samples from the habitat under 
observation they sometimes contained a very considerable number of 
forms. 
From the advanced season at which the material was obtained it 
may be supposed that the growing season for algae was approaching 
its close; indeed towards the end the material in the higher pools often 
appeared far gone in decay. So far as the alpine algae may show 
seasonal phases, it is, then, the autumnal condition that was repre- 
sented. To discuss the distribution of the flora geographically is 
not possible with so small a number of stations represented although 
certain features of habitat are worth consideration. With regard to 
altitude, no sharp boundary separating off an alpine flora was found. 
However, nearly two-thirds of the species found at or above 5500 
feet were not noted below that level, while of those found below 
3000 feet only one-third appeared also in the higher collections. That 
this difference in flora is partly due to other factors than alpine con- 
ditions is evident from an inspection of the list of species, where it 
may be seen, for instance, that Pediastrum only appeared at the higher 
levels, a condition which is explained by the fact that large pools of 
standing water were absent from the lower valleys traversed. In 
