BRITISH SPECIES OF THE GENUS MNIUM. 
2 
1: 
Fro. 9.— Marginal teeth (see p. 58). 
1,2,8: Mnium rostratum. 
4,5: Mnium affine.—4. Part of the margin of a leaf, 
with l-cellular, 2-cellular, and 3-cellular teeth ; 
5. A 4-cellular tooth (rare). 
LINN. JOURN.—BOTANY, VOL. XLIV. 
57 
