Plate XVIII. 



Figs. 1-9. Srirr/nss/uit Bintjfjoldianmn, Hauv. 



1. A sterile Iroiid witii some parts left out. 



3. Basal portion of a well-developed plant showing dichotomously 

 branching stems. 



4. Insertion point of a lateral branch. In this as in the next figure 

 the fulcrant leaf is transformed into a large vesicle. 



5. A fertile lateral branch with ^ receptacles, b, cross-section of 

 a receptacle. Ca. x 4. 



6-S. ^ Receptacular branches of various forms ; those in figs. 7 

 and 8 are somewhat decayed with age. 6 b, cross-section of a 

 receptacle. Ca. x 4. 



9. Vesicles with winged margins. 



