1924] Taylor,—Further Notes on British Columbia Algae 161 
higher country only became slightly ice-coated at night. As a result 
thc algae were in a more vigorous state, and many forms could be 
identified which were missed on the previous trip. Almost all the 
collecting was done in the open parkland and the alpine zones, that 
is from 5500 feet to permanent ice and snow. From lack of a baro- 
meter on this trip it is impossible to give very close approximations 
of the altitudes at which the different species were found. The small 
lakes which were at times found near the glaciers and snow patches 
and above the general grassland proved uniformly barren of algae 
which cculd be detected without a plankton net. The pools and 
rivulets in the meadowland were, however, very rich indeed, and as 
was found previously, very distinct in their individual floras This 
individuality probably largely explains the considerable differences 
between the forms secured on the two trips. 
The small alpine bog pools generally had a scum of partly decayed 
Mougeotia, Zygnema, filamentous blue-greens and unicells, while the 
banks and bottoms were often coated with Scytonema, Schizothrix 
and Nostoc. In the flats below the glaciers a considerable growth of 
filamentous greens (mostly sterile Zygnema and Mougeotia) covered 
the glacial silt among the rocks. Lower where the water fell more 
rapidly the rocks were often coated with such algae as Dichothrix and 
Amphithrix. 'The former was especially notable in the Yoho Valley 
where in cne stream in particular the rocks were entirely covered 
with the calcareous crust and nodules of D. gypsophila. A little lower 
in the parkland area and down the streams well into the forest Hydru- 
rus covered the stones in great masses. The heavy growth of Clado- 
phora which is so familiar in the eastern states appeared to be absent. 
As the study of the collections of material made in 1923 was finished 
there came to hand a study by K. M. Stróm of the alpine algae of the 
Sarek Mountains.! Based on quite cxtensive collections it affords 
interesting material for comparison with the flora in British 
Columbia. Plankton-net gatherings made a valuable addition to 
the list, which also includes somc 219 desmids. Excluding desmids 
and peridineae he reports about 100 species, abcut as many as the 
writer has secured in British Cclumbia. The floras of the two districts 
seem to be of approximately equal richness. Undoubtedly a study in 
the field of living material would add greatly to these lists. Many 
of the forms which were abundant in British Columbia were important 
1 Ström, K. M. The alzae-flora of the Sarek Mountains. Naturwissensch. Unter- 
such. Sarekgebirges Schwedisch-Lappland 3: 437-521, 1923. 
