! i4a) 



Hypnum pratensc Koch. Dawson, on hummocks in 

 swamp. Growing in depressed tufts with distichous leaves 

 and the habits of a Plagtothecium. Stem leaves serrulate or 

 nearly entire, branch leaves distinctly serrulate towards apex 



Hypnum palustrc Huds. Skagway, Lake Marsh and 

 Miles' Canon. The cell walls are somewhat thickened and 

 linear-vermicular, the median up to .040 mm. long and 

 scarcely .004 mm. wide. Alar cells mostly forming a distinct 

 cluster often more or less colored (705 and 767). 



Hypnum fics/ii Ren. & Bryhn. Skagway. This species 

 attains a greater size, 15-20 cm., than any other of the Lim- 

 nobiums. It has leaves secund, broadly ovate-lanceolate, 

 with a blunt, slightly serrulate apex. The leaf-cells are 

 rather irregular and thin-walled except at base, the alar cells 

 somewhat gradually enlarged or 2 or 3 cells rather abruptly 

 enlarged at the more or less decurrent angle. This plant is 

 described as a subspecies of molle by Renauld and Brvhn, 

 but I think it will stand as a distinct species. It differs from 

 molle in having no central strand. It is a larger species, also, 

 with stems below wiry and harsh with the bases of the broken- 

 off leaves. At first glance it more resembles dilatation but 

 the latter has much broader, often almost circular leaves and 

 a distinct, convex cluster of alar cells, as well as central 

 strand (770). 



Hypnum alpinum Schimp. Lake Lindeman. I have 

 compared these specimens with no. 134S Rabenhorst, Bryoth. 

 Eur., the only collection cited by Limpricht, and they are 

 undoubtedly the same ; it may be questioned however, 

 whether alpinum is at best anything more than a variety of 

 dilatatum with slightly more serrulate leaves (771). 



Hypnum alpestrc Sw. Skagway and Lake Lindeman. 

 These specimens have a rather broadly ovate, short-pointed 

 leaf and costa forked near base, with both branches often ex- 

 tending to or above the middle. The leaf-cells are probablv 

 more uniformly elongated and narrowed, with thicker walls 

 from base to apex than in any other Limnobium. In older 



