244 BOTANICAL GAZETTE [ OCTOBER 
in all directions, sometimes complanate; widely spreading to 
strict; narrowly lanceolate to broadly ovate, concave or flat, 
never auriculate or with cells abruptly inflated at the angles, 
more or less decurrent, wings commonly adhering to the stem 
when the leaves are separated; ecostate to strongly costate, 
costa varying from a mere trace at the base to one-third the 
width of the leaf and long excurrent; margins entire to serrate, 
cells in the middle leaf region varying from 1:2 to 1:15, hexag- 
onal or rhomboidal, at the leaf base broader and quadrate to 
long rectangular. 
Sporophyte minute to large, 5™™ to 4™ long, abundant in 
most species: seta generally, slender, flexuous, smooth, varying 
from straw color to dark purple, becoming dull dirty brown with 
age, central strand well developed: capsule oval to cylindrical, 
symmetric or asymmetric, erect incurved or horizontal, ordinarily 
constricted under the mouth in drying, from a large or small col- 
lum, uniformly purple or brown, or of two shades, dark on con- 
vex side and light on concave side, or pale throughout; exothe- 
cium of soft tissue; peristome hypnoid, cilia in a few cases none 
or rudimentary, usually two to four; operculum convex to conic, 
usually obtusely apiculate, rarely rostellate; annulus of one to 
three rows of cells; spores minutely roughened, 12 to 304 in 
diameter: calyptra small, fugacious. 
ANALYTICAL KEY TO THE SPECIES. 
I. Leaves ecostate or with obscure traces of a nerve. 
Alar cells oblong to linear. 
Leaf entire at base, triangular lanceolate F ? A. minutissimun. 
Leaf pica serrulate over transverse cell walls, ovate, aie acumi- 
nate i ae rucel. 
Alar cells mnons or transversely sbrionierek 
Plants minute (1— 
Leaves ovate, acuminate, cells irregular, short 1: 2 or less 
A. confervoides. 
Leaves lanceolate, long acuminate, cells regular, I :3 or more in the 
middle and apical regions j : ; A. sublile. 
Plants twice as large or more ; , ‘ , F , adnatum. 
