49 



Fertile verticils mostly simply divided. 6~b. 



Q[ Qj. Fertile vert. 2-divided. 



Q) Heads large. 670. cryplostachya A. Br. 

 Q)Q) Heads small. 6yd. inicrocephala A. Br. 

 b) Heads peduncled. 6ye. podostacliya A. Br. 

 3) Nucleus, 160-180 long. 68. polycephala A. Ik. 

 * * Monoecious. 



f" Fertile verticils not contracted into elongated, gelatinous 

 spikes. 



1) Fertile verticils commonly contracted into loose, hairy 



heads, the two last cells of the leaves commonly 

 forming a two-celled mucro. 69. Hookeri A. Br. 

 i a) Terminal mucro one-celled. 70. Bonaerensis ( S ). 

 Spegaz. 



2) Fertile verticils in small, sub-sessile heads, long over- 



topped by the leaves of the sterile verticils. 71. 

 trichotoma A. Br. 



a) Leaves 2-divided, terminal segments 3-4-celled; Sub-sp. 



72. Zeylieri A. Br. 



b) Fertile leaves more simple, rarely 2-divided, terminal 



segments 4-5-celled ; sub-sp. 73. Lechleri A. Br. 



(S). 



3) Fertile verticils commonly sub-moniliform, terminal seg- 



ments of leaves more or less incurved. 

 Q Leaves 2- (1-3-) divided; terminal segments 4- (3-5-) 



celled. 74. ornitliopoda A. Br. 

 OO Leaves partly 3- (4-) divided; terminal segments, 3- 



(4-) celled. 75. havaiensis Nordst. 

 f f Fertile verticils contracted into elongated, gelatinous spikes 



(interrupted at the base). 



X Leaves, 3-4-divided. 76. capillata A. Br. 

 X X Futile leaves 2-divided. 



Q) Slender, terminal segments of the fertile leaves, 2-3 



celled. 77. leptostachys A. Br. 



Q)Q Stouter; terminal segments of fertile leaves bi-cellular; 

 the colored membrane of the nucleus densely 

 irregularly reticulated. 78. inlerrupta A. Br. 



30)0) Ultimate segments of the fertile leaves, 4-celled; nu- 

 cleus with broad sulci ; densely puncto-reticulated ; 

 the punctae arranged in four rows. 79. ArchavaleiiX 

 (S) Spegaz. 



