1904] CARDOT AND THERIOT: MOSSES OF NORTH AMERICA 381 
X90; @,d,d, transverse sections of a leaf X go; e, transverse section of the 
costa X 200; f, alar cells X 200; g, basal areolation X200; 4, middle 
cells X 200; 2, areolation in the upper part X 200.—2. Fissidens Bushit. a, 
entire plant, nat. size; 5,4, leaves X 26; ¢c, marginal areolation in the middle 
X 270; d@, arevlation in. the upper part xX 270.—3. Desmatodon Bushit. a, 
entire plant, nat. size; 4, 6, 6, leaves x 13; 6’, 6’, perichaetial leaves x 13; 
¢, basal areolation X 200; d, areolation in the upper part X 200; e, capsule 
with calyptra X 13; 4, capsule in dry state X 13; g, peristome X 26; 4, por- 
tion of the peristome X 200. 
Plate XVII1I,—1. Pottia nevadensis. a, entire plant, nat. size; 4, 4, leaves 
X 26; c, perichaetial leaf x 26; d@, areolation in the middle of a leaf X 135; 
e, capsule in moist state X 13.—2. Barbula macrotricha. a, entire plant, nat. 
size; 4, lower part of the same X13; ¢,¢, lower leaves X 26; c’, upper leaf 
X 26; d, transverse section of a leaf X 200; ¢, basal areolation X 135; 4 
middle cells x 135; g, capsule X 13.—3. Barbula Bakeri. a. entire plant, 
nat. size; 4,4, 4, leaves X 13; ¢, perichaetial leaf X 13; d, d, transverse sec- 
tion of the leaf X90; e, basal areolation X200; f, middle cells X 200; g, 
capsule in moist state X13; 4, capsule with calyptra X13; 2, peristome 
X 30; J, portion of the persistent annulus X 200. 
Plate XIX.—1. Grimmia cognata, a, entire plant, nat, size; 4, 4, leaves 
X13; c,c, transverse sections of the leaf x 60; d, transverse section of the 
leaf in the upper part x 80; ¢, basal areolation x 270; /, areolation in the 
upper part X 270.2. Bryum anceps. a, entire plant, nat. size; 4, 6, 6, leaves 
X26; c, transverse section of the leaf x26; d, transverse section of the 
nerve X 195; ¢, basal areolation X 135; /, marginal areolation in the middle 
X 135; g, areolation in the upper part X 135.—3. Bryum dimorphophyllum. 
a, entire plant, nat. size; c,c, lower leaves X 13; 4, upper leaf X 13; 4’, peri- 
chaetial leaf x 13; d, transverse section of the leaf X 60; ¢, areolation in the 
middle x 270; f areolation of the upper part X 270; g, capsule ripe and 
deoperculate, in dry state X 73; 4, the same in moist state X13; 2, lid X13; 
J, portion of the annulus X 135. 
Plate XX.—1. Grimmia Hendersoni. a, entire plant, in dry state, nat. 
size; a’, the same, in moist state, nat. size; 4, lower leaf X13; 4’, upper leaf 
X13; ¢, point of the same X60; 4d, basal areolation X 200; e, middle cells 
X 200; f, capsule with calyptra, in dry state X13; capsule operculate, in 
moist state X 13.—2. Webera Debati. a, entire plant, nat. size, 6, 6, leaves 
X 32; c, basal areolation x 135; @, areolation of the upper part X 135.— 
3. Webera chlorocarpa. a. entire plant, nat. size; 6, d, leaves X13; ¢ apex 
of a leaf x 32; d, base of a leaf X32; 4 marginal areolation in the middle 
X135; f, perichaetial leaf X13; 2 capsule in dry state x 135 h, capsule 
deoperculate, in moist state X13; %, capsular membrane with a stomata 
X 135; 7, portion of the annulus X 135; 4, portion of the peristome Xx 90. 
Plate XXI—1. Bryum polycladum, a, entire plant, nat. size; b, b, , 6, 
leaves X 13; c, basal areolation X 135; @, middle cells X 135; @ — 
