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 to apex. Young 

 leaves have alar cells hyaline. Median cells measure .005 

 mm. wide and up to .060 mm. long. The leaves are usually 

 minutely serrulate all round (768 and 769). 



Ilxpnum 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 polar el^'mdb. 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). 



Hyjmum 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 zn&gigantcum 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). 



Hypnum sarmentosum Wahl. In small pond by snow 

 banks about 1000 feet above Lake Lindeman (776). 



Hypnum sarmentosum fontinaloides Berggrn. Bonanza 

 Creek near mouth. On rocks in the bottom of a small 

 stream. This is a variety with long, slender stems and 



