( 128 ) 
pointed, more entire, and costa more frequently phigh 
just below point (584). 
Collected in good fruit July 17, 1899, at Dawson, also at 
the mouth of the little Salmon River. The plants form ex- 
tensive mats, often many feet across, in low, wet places. 
Bryum suborbiculare Philibert, sp. nov. 
Apparently dioicous, no male flowers found. Tufts up to 
21cm. high. Stems seldom branching. Leaves in 3 or 4 
rosettes with innovations starting from their bases. Outer 
perichaetial leaves oblong, somewhat acutely pointed, 2 mm. 
long, upper stem leaves a little shorter, very broadly ovate, 
often obtuse, all entire with costa percurrent or mostly so. 
Borders revolute below and of about 3 rows of elongated 
cells, toward apex becoming flat and cells scarcely elongated. 
Lower leaves small, obtuse, often nearly as broad as long, 
with costa vanishing. Inner perichaetial leaves very broadly 
ovate-lanceolate, small, with costa vanishing. Median leaf- 
cells rhomboidal to hexagonal, from scarcely elongated to 
twice longer than broad, up to .o25 mm. long. Cell walls 
not pitted. Capsule with lid up to 3 mm. long, broadly obo- 
vate, the sporangium gradually narrowing to a very short 
collum. Lid low-convex, papillate. Seta up to 24 cm. 
high. Exostome with lower dorsal plates narrow (1-3) and 
25-30 lamellae on inner face. Endostome free with basilar 
membrane extending over 3 up, the segments slender above 
and widely perforate with mostly 3 long, finely appendicu- 
late cilia between. Annulus of 3 rows of cells. Exothecal 
cells about mouth of capsule transversely elongated, in 2 or 
3 rows, near middle the cells about twice longer than wide, 
toward base irregular, sinuous walled, with stomata about 
.035 mm. long. Spores nearly or quite smooth, up to .o16 
mm. (Plate 20.) 
This small moss is peculiar in having the broad, mostly 
obtuse leaves clustered in 3 or 4 rosettes along the stem. It 
does not seem to be related very closely to any other Ameri- 
can species. 
Dawson, growing in swamp with Czncldium and appar- 
ently rare. Collected in good fruit, July 2, 1899 (577). 
Plagiobryum Zierit (Dicks.) Lindb. (Zzeria julacea 
Schimp.) A few sterile specimens collected on earth in 
crevices of rock about 1000 ft. above Lake Lindeman (660). 
