31 
Il. Drummondiec. Leaf-cells rotundate.. Spores 
very large. 
107. .Drummondia. Capsule exserted; teeth rudi- 
mentary; pedicel straight. Calyptra concave, involving 
the capsule, finally cucullate. Leaves without hairpoint; 
cellwalls not sinuous. Stem decumbent; branches short 
and erect. Habit of Orthotrichum. 
B. Capsule thick-walled, sublateral on short bran- 
ches; lid thick, long-persistent upon the thick and elevate 
columella. 
IIl. Scouleriece. Capsule immersed, very broad and 
eupuliform; calyptra cucullate. 
108. Scouleria. Capsule small-mouthed when young, 
blackish when dry; teeth very short and brittle, finally 
often adhering to the lid. Leaves dentate, without hair- 
point; the lower ones, when emarcid, with persistent costa ; 
cellwalls not sinuous. Spores very large, about 0,05—0,06. 
mm. Stem branching, floating in water. Plants robust. 
Dioecious. Habit of Cinclidotus. 
Fam. 24. Weisiaceæ. “ 
A. Peristome not cancellate. 
I. Barbulec. Peristomial teeth partite to the basal 
~ (often tessellate, more or less distinct) tube, with hair-like, 
: mostly long and often contorted branches. Capsule without 
_ distinct neck, generally straight. : | 
* Leaves without lamellze on the costa. | 
| 109. Barbula. Capsule symmetric, straight or (rarely) 
faintly curved; teeth not incurved. Leaves sins papillose ; 
cell-walls not sinuous. 
: 110. Ceratodon. Capsule (more or m asymme- 
. trie, usually eurved; teeth incurved when dry, n not contor- 
ted. Leaves smooth; cell-walls not sinuous. - 
~ A11. Geheebia. Leaves papillose ; cell- -walls sinuous. 
Capsule unknown. Plants robust. 
Costa, Papillose: 
** Leaves with lamelle or mood filaments c on the a ; T | 
