(119 ) 
perichaetial up to 3 mm. long with larger, loosely clasping 
base and shorter point; costa vanishing just below apex; 
leaf-cells round to oblong above, mostly slightly transversely 
elongated in margins, up to about 8 wide and 124 long, 
the lower cells square or short-rectangular toward margin 
and more elongated as ee near costa, paler than above, 
not hyaline: seta about 5 mm. high; capsule oblong, 1.5 
mm. long, with an obliquely rostrate lid one half as long; 
exothecal cells thin-walled, irregular, mostly 2 or 3 times 
longer than broad, with stomata in one row near base; peri- 
stome none; sanulde large, fragile; calyptra cucullate, ex- 
tending well below the middle of capsule: spores rough, up 
to 18 # in diameter. 
Juliaca, Peru, 3820 meters on sandstone, May 15, 1902 
(2874). 
Didymodon Pelichucensis sp. nov. 
Evidently dioicous. Stems up to 5 mm. high, mostly 
simple, with radicles at base: lower leaves oblong, mostly 
obtuse, much smaller than upper; leaves above about 3 mm. 
long, nearly linear, the perichaetial with a somewhat en- 
larged loosely clasping base, keeled above with flat margins, 
below more or less recurved on one or both sides; apex of 
upper leaves usually obtuse, shortly apiculate, slightly and 
irregularly dentate on either side, with costa vanishing sev- 
eral cells below point; leaf-cells above papillose, more or less 
hexagonal, about 6 # in diameter, below rectangular and red- 
dish to base: seta up to 12 mm. high; capsule oblong, erect, 
without annulus, the lid conical, its height 114 times its basal 
diameter; teeth of peristome erect, red, papillose, divided to 
base into two terete segments; calyptra very long-beaked, 
cucullate, extending but little below the lid, up to 1.5 mm. 
long: spores up to 14 # in diameter. 
Pelichuco, 3450 meters, May 3, 1902 (2864). In habit 
this species is not unlike some of the smaller forms of D. 
rubellus. 
Didymodon subtophaceus sp. nov. 
Dioicous. In dusky-green, easily separating tufts with 
branching stems, up to 2 cm. high, with few radicles near 
base: stem-leaves incurved when dry, erect-spreading when 
moist, the upper about 2 mm. long, lanceolate, finely papil- 
lose, with more or less obtuse and cucullate apex and margins 
