(143) 
leaves the very distinctly inflated cluster of alar cells is ap- 
parently always more or less deep red, sometimes the whole 
base being colored or even the cell walls up toapex. Young 
leaves have alar cells hyaline. Median cells measure .005 
mm. wide and up to.o60 mm. long. The leaves are usually 
minutely serrulate all round (768 and 769). 
Hypnum ochraceum Turn. Dawson, on rock in bed of 
stream. The stems of these specimens are rather slender and 
elongated, with leaves shorter and broader-pointed than in 
typical specimens. The hyaline alar cells are more decur- 
rent, I believe, than any other species of the group. The 
outer wall of the stem consists of a single layer of large, thin- 
walled cells next several rows of thickened cells (772). 
Hypnum polare Lindb. Lake Lindeman. Growing along 
low wet shore. This species is distinguished from any of 
our others by the ovate-oblong leaves, with stout nerve, very 
convex on the back, vanishing just below the apex and becom- 
ing as wide or wider above the middle than at the middle. 
Alar cells scarcely enlarged or forming a distinct cluster. 
The plant has been previously collected in several localities 
in Europe and also in Greenland (773). 
HHypnum cordifolium Hedw. Klondike River bottom near 
mouth. I refer specimens here having scarcely branched 
stems, alar cells not forming quite so distinct a convex group 
as in the next and other leaf-cells perhaps a little wider, none 
of the assigned differences between this and gzganteum seem 
very constant however (774). 
Hypnum giganteum fluitans Klinggr. In still water of 
small stream flowing into Marsh Lake. These specimens 
are the largest I have seen, the leaves measuring 4.5 by 3 
mm. The leaves on lower stem are distant, the branches 
mostly few, short and irregularly placed (775). 
HHypnum sarmentosum Wahl. In small pond by snow 
banks about 1000 feet above Lake Lindeman (776). 
fypnum sarmentosum fontinalordes Berggrn. Bonanza 
Creek near mouth. On rocks in the bottom of a small 
stream. This is a variety with long, slender stems and 
