198 103. SELAGINELLA. A*. PLEIOSTELICAE. 



d.d. Lateral leaves not calcamte-auriculate. 



(181) S. velutina. 

 c.c. Stems smooth. 



9 Pinnulae invariably simple. 

 A Spikes 1 2-nate. 



o Proportionally small plants. 



(183) S. elliptica. 



oo Proportionally large or middle- 

 sized plants. (182) S. Wallichii. 

 A A Spikes 3 6-nate. 



(184) S. polystachya. 

 9 9 Pinnulae not invariably simple. 



A Lateral leaves of the stem not auri- 

 culate-cordate at the base, or if so, the 

 auricles not hamate-incurvate. 

 o Spikes to 2 mm. diam. 



(192) S. Pouzolziana. 

 oo Spikes 2 mm. or more diam. 



(185) S. Schildei. 



A A Lateral leaves of the stem 2-auriculate- 



cordate or semiauriculate-cordate at 



the base, the auricles hamate-incurvate. 



o Leaves of the stem distinctly 



dimorphous, the intermedial 



acute, the lateral blunt or 



rounded at the apex. 



(186) S. permutata. 

 oo Leaves of the stem isomorphous, 

 though the intermedial mostly 

 smaller than the lateral. 



(187) S. Kittyae. 



Largest pinnulae pinnately branched f or the central di- 

 chotomous. 



b. Sporophylla proportionally short and broad, hardly 

 exceeding the sporangia. 



(188) S. Willdenowii. 



b.b. Sporophylla proportionally long and narrow, distinctly 

 exceeding the sporangia. 



