( 129) 
when dry, widely spreading from a more erect base when 
moist, up to 5 mm. long, lanceolate, very narrowly acute, 
keeled, borders recurved below, flat toward apex; leaf-cells 
all more or less elongated in upper leaf, 8-164 long, with 
low papillae, toward base up to 40-50 » long, with somewhat 
thickened walls: capsule oval-oblong, 8-ribbed, short-ex- 
serted, about 1.5 mm. long on a seta of equal length; 
peristome of 8 papillose teeth with paler, papillose, lanceo- 
late segments, at base one half the width of teeth and of 
equal height; stomata superficial; lid convex-apiculate ; 
calyptra without hairs, plicate, more or less undulate or 
mammillate on the ridges, finally split at base: spores nearly 
smooth, up to 25 # in diameter. 
Pelichuco, 3300 meters, May 4, 1902, on bushes (2811); 
Tacacoma, 3000 meters, June 10, 1902, on bushes (1835); 
above Sorata, 2700 meters, September 8, 1901, on trees (1836). 
ORTHOTRICHUM EXSERTISETUM C. Mill. 
Above Sorata, 2700 meters, September 27, 1902 (1839). 
Orthotrichum Tacacomense sp. nov. 
Monoicous. Somewhat compactly tufted plants with much- 
branched stems up to 3 cm. high: leaves rather loosely ap- 
m. 
long, broadly lanceolate, acute, keeled, recurved on margins 
elow with margins flat above; perichaetial leaves with larger 
ovate base up to 5 mm. long, with costa more or less excur- 
rent into a short point; leaf-cells above elongated, 8-16 wu long 
and 6-8 » wide, with low papillae, below, in stem-leaves, 
cells up to about 40 # long with walls somewhat thickened and 
pitted, in perichaetial leaves lower cells pale and longer with 
thinner walls: capsule oblong, at first smooth, slightly con- 
tracted under the mouth, finally distinctly 8-striate one half 
down, up to 2.25 mm. long, on a seta about 0.75 mm. 
long, the point of the convex-apiculate lid scarcely or not 
stome; teeth 8, pale, papillose, more or less split alon 
middle; cilia 8, very pale, papillose, narrow below, often 
broader above and more or less united in pairs, with rounded, 
loosely jointed, irregular articulations; calyptra sparsely 
hairy throughout, deeply plicate, erose at base: spores pale, 
slightly roughened, up to 24 p» in diameter. 
