1897 ] NORTH AMERICAN SPECIES OF AMBLYSTEGIUM 291 
Fig. 5. A. adnatum: a, leaf; 6, cells from the alar region; c, cells 
from the middle region; d, cells from the apical region. 
Fig. 6. A. serpens - a, leaf ; 6, cells from thealar region; c, cells from the 
middle border region ; @, cells from the apical region. 
1G. 7. A. juratzkanum.: a, leaf; 6, cells from the alar region ; c, cells 
from the middle border region ; d, cells from the apical region. 
1G. 8. A. compactum: a, \eaf; 6, cells from the alar region; ¢, cells 
from the middle border region ; d, cells from the apical region. 
G. 9. A. lescurit: a, leaf; 6, cells from the alar region ; ¢, cells from the 
middle ewes d, cells from the apical region. 
IG. 10. A. varium: a, leaf; 6, cells from the alar region; c, cells from 
the ee border region; d, cells from the apical region. 
PLATE XII. 
Fic. 1. A. irriguum: a, leaf; a’, leaf of the variety spintfolium ; b, ire 
from the ene region of a"; c, cells from the middle border region of @ 
d, cells from the apical region of a'. 
Fig. 2. A. fluviatile: a, leaf; 6, cells from the alar region ; ¢, cells from 
the middle border region ; d, cells from the apical region 
G. 3. A. noterophilum: a, leaf; a*, leaf, terrestrial form; @?, leaf, large 
aquatic form; 4, cells from the alar region ; c, cells from the middle border 
region; c*, cells from the middle border region, terrestrial form; d, cells 
from the apical region of lamina; ¢, transections of the costa at the middle 
of the leaf and just above the lamina; / transection of leaf near its base; /", 
transection of leaf near its middle; g, tip of the leaf of the large aquatic form ; 
4, capsule. 
1G. 4. A. vacillans: a, leaf; b, cells from the alar Sitti c, cells from 
the ae border region ; @, cells from the apical re 
. A. kochti: a, leaf; 8, cells from the ae region; ¢, cells from 
the cot border region; d, cells from the apical region. 
PLATE XIII. 
. A. riparium: a, leaf; 6, cells from the alar region; ¢, cells from 
the nial ripe region; d, cells from the apical region. 
1G. 2. A. riparium floridanum: a, leaf; 6, cells from the alar region ; 
¢, cells Anes the middle border region ; ¢, cells from the apical region. 
