4 8 



QQ Inferior cells of terminal segments longer than broad; 

 nucleus, 240 long. 55. guineensis Kiitz ; A. Br. 



b} Heterophyllce. Leaves dissimilar. 



* Dioecious. 



f The small, adventitious leaves fewer (1-20 ;) larger 



leaves, 1-3 times divided. 



X Smaller leaves, 1-6 (-12); ultimate segments of leaves 

 commonly 3-5. Stem, 250-720 in diam. 56. 

 conglobota A. Br. 



X X Smaller leaves about 14 ; ultimate segments of leaves 

 commonly 5-7 ; stem, about 1000 in diam. (spe- 

 cies doubtful). 57. licteropliylla A. Br. 

 f | The small, adventitious leaves about 40 ; most of them 



4 times divided. 58. conges/a A. Br. 

 * * Monoecious. 59. hyalina (DC.) Kiitz. 



C Polyarthrodactylae. Ultimate segments of the leaves (rarely 2-) 

 3-6-celled, often not mucroniform. 



* Dioecious. 



| Sporophydia also aggregated in the base of the verticil. 60. 



phimosa A. Br. 

 f f Sporophydia not in the fundus of the verticil. 



X Fertile verticils not contracted into heads. 61. diffusa A. Br. 

 X X Fertile verticils contracted into heads, more or less dense 

 or interrupted; sterile leaves of lower verticils simple. 

 Fertile and sterile leaves 3-4-divided. 



Q) Terminal cell of the last segment nearly as thick as 



the penultimate cell. 



4 Ultimate segments 2-4-celled. 62. niyriotricha A. Br. 

 4J: 4 Ultimate segments 2-celled. 63. dualis Ndst. (mss.) 



Terminal cell mucroniform. 64. liuiUensis A. Br. 

 Sterile leaves often simple; fertile, i-2-divided. 



1) Nucleus, 300-380 long. 65. cristala A. Br. 



2) Nucleus, 200-270 long. 



-j- Fertile verticils loosely condensed ; terminal seg- 

 ments of the leaves acute, gradually attenuate. 

 66. tasmanica (F. Milll.) A. Br. 



-)- + Fertile verticils densely contracted, terminal seg- 

 ments obtuse. 67. gelatinosa A. Br. 

 a) Heads sessile. 



Proliferous. 6ja. cladostachya A. Br. 

 Not proliferous. 



