43 



2) Leaves shorter, condensed above into a minute 

 head, sporophydia solitary, 8c. mauriliana 

 A. Br. 



-j- -j- Larger, habit of N. translucens, segments of 

 leaves very short, sporophydia aggregated 



1) Larger. Sd. Bellangeri. A. Br. 



2) Smaller, with shorter leaves. Se. Lindheimeri 



A. Br. 

 Sterile leaves long, overtopping the fertile, which 



are collected into terminal and axillary heads, 

 -j- Segments of the sterile leaves very short, sporo- 

 phydia solitary. 9. sub-species, Gollmer- 

 iana A. Br. (S). 



-] \- Segments of the sterile leaves long (Fig. 45 sterile 

 leaves not shown). 10. subsp. glomerul- 

 ifera A. Br. 

 Fertile verticils enveloped in mucus, large, 11. prae- 



longa A. Br. 



b. Heterophyllae. Leaves dissimilar (in a verticil are leaves of 

 two sorts, some bearing nodes and others simple, ad- 

 ventitious; see page 23). 12 (Fig. 46). clavata A. Br. 

 b. Repeatedly branched. 



* Dioecious, segments of leaves short (polyglochin). 13. 



tricuspis A. Br. 



* * Monoecious, segments of leaves large. 

 -|- Nucleus 270 long. 14. Stuarti A. Br. 

 _|__|_ Nucleus 215 long. 15. Macounii Allen. 



B. Diarthrodactylae. Ultimate segments of the leaves 2- (rarely 3-) 



celled; ultimate cell mucroniform. 

 a. Homceophyllse. Leaves similar. 



* Dioecious. 



j" Fertile verticils enveloped in mucus. 

 X Sterile leaves branched with very short tips. 16. glceos- 



tacliys A. Br. 

 X X Sterile leaves not branched with very short tips. 



4 Ultimate, mucroniform cell of the last segments of 



the leaf elongated. 1 7. subtilusima A. Br. 

 4J: =j Ultimate cell short, the colored membrane of the nu- 

 cleus covered with small dentate scales. 21. Gun- 

 tin A. Br. 

 ff Fertile verticils not enveloped in mucus. 



