I20 



MOSSES AND FERNS 



CHAP. V 



wider, and beneath it an intercellular space is formed which 

 widens into a cavity whose cells secrete the abundant mucilage 

 filling it. This mucilage escapes through the clefts and covers 



Fig. 56. — Anthoccros fiisiformis (Aust.). A, Young plant with single growing point {x), X 85 ; B, 

 horizontal section of the growing point of a similar plant, X525 ; x, the single apical cell; C, 

 similar section of a growing point from an older plant, with possibly more than one initial cell, 

 X 260 ; D, a mucilage slit from the ventral side of the thallus, X 525. 



the growing point in the same way as that secreted by the 

 glandular hairs in the Jungermanniaceae. 



Each cell of the thallus contains a single chloroplast which 

 may be either globular or spindle-shaped, or more or less 



