4i6 



MOSSES AND FERNS 



CHAP. 



B. 



Mi 



Sp. 



Fig. 242.—Azolla Mculoides. A, Mature sporophyte, X2; B, lower surface of a branch 

 with two microsporangial sori (,sp), X6; C, macrosporangial (ma) and microspo- 

 rangial (mi) sori, Xio. 



