(259) 
branchlets; cross-sections of stem about 175 » in diameter, 
without central strand or outer rind, the rind composed of 
about 4 rows of small thick-walled cells; leaves mostly 
homomallous, simply costate to near middle or costa shorter 
and unequally forking; the stem-leaves short ovate-lanceo- 
late, about .8 mm. long and .4 mm. wide, very concave, ser- 
rulate above, with a scarcely distinct cluster of cells at basal 
angles; branch leaves much narrower than stem-leaves and 
gradually smaller toward the apex of branch; leaf-cells from 
elongate-hexagonal above to more or less linear below, the 
median about 7 # wide and 20-36 # long; perichaetial leaves 
gradually narrowed to a long, slender, flexuous, slightly ser- 
rulate apex; seta about 18 mm. long; capsule from nodding 
to mostly horizontal, oblong, with the obtuse, mamillate lid 
1.6 mm. long, the scattered stomata near base nearly round, 
about 28 # in diameter; annulus two rows of cells high; teeth 
of peristome pale brown, with outer plates rather indistinct 
and finely papillate-striate, the segments of endostome nearly 
as long as teeth with narrow perforations along keel and with 
one to three shorter cilia between, from a basilar membrane 
extending above mouth two fifths the height of teeth ; smooth 
spores up to 164 
Pelichuco, 3300 meters, on rock, April 29, 1902 (2781). 
Calliergon Luipichense sp. nov. 
Plants sterile, i in deep blackish tufts in water; stems some- 
mostly destroyed by maceration on stem below, above closely 
imbricate, narrowly decurrent, about 2.5 mm. long and 0.8 
mm. wide, ovate-lanceolate, broadest about one fourth up 
from base, slightly serrulate at the often recurved, short- 
cuspidate apex, strongly costate to a little below the apex ; 
leaf-cells narrowly linear, the median about 5 # wide and 
80 # long, with lateral walls thickened and more or less pitted, 
at basal angles enlarged and hyaline or reddish, forming a 
distinct cluster. 
Growing in a small pond at 4300 meters elevation near the 
Luipichi Pass, Sept. 9, 1901 (2021). This species is perhaps 
nearest some of the branching forms of C. sarmentosum. 
SCORPIDIUM SCORPIOIDES (L.) Limpr. 
In pond with preceding species. The older leaves in these 
