(140) | 
Dawson, in swamp water, in fine fruit July 17, 1898 (746). 
fTypnum falcatum Brid. About springs at head of Lake 
Bennett. Leaves nearly entire or serrulate slightly below. 
Median cells about .oo4 mm. wide and .030 to .o60 mm. 
long and cell walls all thickened (748). 
Hypnum crista-castrensis L. Lake Lindeman and Klon- 
dike River bottom. Not found in fruit (750). 
Hypnum reptile Michx. Dawson, onrock. Median leaf- 
cells .004 by .030-.040 mm., scarcely vermicular, alar cells 
short oblong to quadratic. Leaves not decurrent (756). 
fHypnum hamulosum B. & S. Dawson. At base of trees 
in damp places. These specimens are rather more robust 
than usual with longer and more narrowly pointed peri- 
chaetial leaves. Cross sections of stem are oval, about .200 by 
.160 mm. This is smaller than given by Limpricht (.300- 
-350 mm. long), but no. 491, Raben. Bry. Europ., cited by 
him, shows sections similar to mine in every way. The thin 
outer cells of the stem have the exposed surfaces mostly 
sunken in or worn way giving the surface a rough, papillose 
appearance in cross section. The thickened cells next the 
outer wall are in 3 or 4 rows. Central strand distinct. The 
leaves are more or less plicate and border revolute below on 
one side (754). 
FHypnum subplicatile (Lindb.) Limpr. Lake Lindeman, 
on damp rock and earth. This plant is very close to call- 
chroum but differs in being rather smaller with regularly pin- 
nate branches, leaves wider just above the base and abruptly 
narrowed to the insertion and capsule shorter. Cross sec- 
tions of stem show an indistinct central strand and walls of a 
row of thin outer cells next about 3 rows of thick-walled 
cells. Median leaf-cells slightly vermicular, about .oo5 mm. 
wide and .o4o-.060 mm. long, alar cells mostly forming a 
small but distinct, convex, pale cluster. Stem leaves entire, 
borders flat, terminal branch leaves minutely serrulate, peri- 
chaetial leaves gradually narrowed to long, serrulate, slender 
point. 
According to Limpricht this species has been previously col- 
