(142) 
Hypnum pratense Koch. Dawson, on hummocks in 
swamp. Growing in depressed tufts with distichous leaves 
and the habits of a Plagiothectum. Stem leaves serrulate or 
nearly entire, branch leaves distinctly serrulate towards apex 
(730). 
Hypnum palustre Huds. Skagway, Lake Marsh and 
Miles’ Cafion. 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 (765 and 767). 
Hypnum Bestii Ren. & Bryhn. Skagway. This species 
attains a greater size, 15-20 cm., than any other of the Zzm- 
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 mol//e by Renauld and Bryhn, 
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 d/atatum 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. 1348 Rabenhorst, Bryoth. 
Eur., the only collection cited by Limpricht, and they are 
undoubtedly the same; it may be questioned however, 
whether a/pinum is at best anything more than a variety of 
dilatatum with slightly more serrulate leaves (771). 
Hypnum alpestre 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 probably 
more uniformly elongated and narrowed, with thicker walls 
from base to apex than in any other Limnobium. In older 
