Plate X. 



Figs. 1-7. Sargafisum Horneri Ag. 



1. A sterile yonng frond. 



2. Basal part of an old plant with a latei-al branch. 



3. Basal part of a well develojied plant shovvinü; naked basal stems 

 and a lateral branch, with cross-sections of stems. 



4. a, Insertion point of an npper lateral branch, h, cross sections of 

 the stem, x 2. 



.5. A Ç fertile branchlet. 



G. A 6 fertile branchlet. 



7. o, b, c, Leaves on the terminal, middle and basal part respec- 

 tively of a terminal branchlet. 

 Fig. 8. Sargasft7im. Ilorneri f. furcatodentatum O'Kuntze. 

 A typical fulcrant leaf. x2. 



