VI. 



THE BRYALES 



.193 



to multiply by division after the cells are fully grown. The 

 marginal cells in the leaf of Funaria are much narrower than 

 those between them and the midrib, and their forward ends 



Fig. 100. — Funaria hysrometrica. A, Transverse section of the apex of a young shoot, 

 X515; B, C, cross-sections of young leaves, X515; D, cross-section of the stem, 

 X257. 



often project somewhat, giving the margin of the leaf a serrate 

 outline, which is also common in many other Mosses. 



The Branches 



For the study of the branching of the stem, Amblysteginm 

 again is much better than Funaria, whose short stem and infre- 

 quent branching makes it difficult to find the different stages. 

 In Amhlystegium, however, every median section will show 

 some of the stages, and it is easy to follow out all the details, 

 as has already been done in Fontinalis by Leitgeb. The lateral 

 shoot originates from a basaf cell of the segment below the 

 middle of the leaf. It is very easily seen that it belongs to the 

 13 



