31 



II. Drummondiece. Leaf-cells rotundate. Spores 

 very large. 



107. Drummondia. Capsule exserted; teeth rudi- 

 mentary; pedicel straight. Calyptra concave, involving 

 the capsule, finally cucuUate. Leaves without hairpoint; 

 cellwalls not sinuous. Stem decumbent; branches short 

 and erect. Habit of Orthoirichum. 



B. Capsule thick-walled, sublateral on short bran- 

 ches; lid thick, long-persistent upon the thick and elevate 

 columella. 



III. Scouleriece. Capsule immersed, very broad and 

 cupuliform; calyptra cucuUate. 



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,o5 — 0,oft 

 mm. Stem branching, floating in water. Plants robust. 

 Dioecious. Habit of Cinclidotus. 



Fam. 24. Weisiaoese. 



A. Peristome not cancellate. 



I. Barbulece. 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 lamellss on the costa. 



109. Barbula. Capsule symmetric, straight or (rarely) 

 faintly curved ; teeth not incurved. Leaves usually papillose ; 

 cell-walls not sinuous. 



110. Ceratodon. Capsule (more or less) asymme- 

 tric, usually .curved ; teeth incurved when dry, not contor- 

 ted. Leaves smooth; cell-walls not sinuous. 



111. Geheehia. Leaves papillose ; cell-walls sinuous. 

 Capsule unknown. Plants robust. 



** Leaves with lamellae or brood-filaments on the 

 costa, papillose. 



