44 



Habit sub-moniliform ; nucleus 430-470 long. 18. remota 



A. Br. 

 Habit not sub-moniliform. 



1) Fertile leaves in part, 4-divided, nucleus 270-330 long. 



19. dispersa A. Br. 



2) Leaves 2-3 divided. 



a) Heteromorpha, sporophyd. unknown. 20. Robert- 



sonii A. Br. 

 b} Homo-morpha ; nucleus 240-270 long. 21. Gunnii 



A. Br. 



3) Leaves twice divided, nucleus 180-200 long. 22. Son- 



den' A. Br. 



* Monoecious. 



f Leaves simply branched, or twice -thrice -divided, the 

 ultimate divisions not much abbreviated. Macro- 

 dactylae. (N. mucronata, A. Br. , in its broadest 

 sense ; [the type of the group, T. F. A.] compare 

 also f t)- 

 X Leaves branched or twice-divided (sub-flabellatae) ; 



compare X X- 



Heads not enveloped in mucus. 



-f- Fertile verticils contracted in axillary heads ; nu- 

 cleus, 290-340 long. 23. axillaris A. Br. 

 -j--f- Fertile heads contracted, numerous, terminal and 

 axillary; nucleus, 250-260 long. 24. Morongii 

 Allen. 



-| | |- Fertile heads small, terminal, or axillary; nucleus, 

 400-450 long. 



1) Robust, verticils extremely dissimilar. 



a) Ultimate segments 2-celled. 25. translucens 



(Pers. ) Ag. 



b) Leaves at length simply branched ; segments 



often 3-celled. 26. tricellularis Nordst. 



2) More slender, sterile leaves becoming shorter, 



gradually passing into the loose fertile heads 

 (transition to N. mucronata). 27. brachy 'teles 

 A. Br. 

 Heads enveloped in mucus. 



-f- Robust, nucleus 250 long. 28. leptoclada A. Br. 

 -\ \- Very fine, leaves always simply branched; nucleus, 

 300-320. 29. microphylla A. Br. 



