198 103. SELAGINELLA. A^. PLEIOSTELICAE. 



d.d. Lateral leaves not calcarate-auriculate. 



(181) S. velutina. 

 c.e. Stems smooth. 



9 Pinmilae invariably simple. 

 A Spikes 1 — 2-nate. 



Q 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 Pinnula^ not invariably simple. 



A Lateral leaves of the stem not auri- 

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

 auricles not hamate-incurvate. 

 o Spikes to 2 mm. diam. 



(192) S. Pouzoiziana. 



O0 Spikes 2 mm. or more diam. 



(185) S. Schildei. 



A A Later'al leaves of the stem 2-auriculate- 



cordate or semiauriculate-cordate at 



the base, the atiricles hamate-inairvate. 



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. 

 a.a. Largest pinnulae pinnately branched, or the central di- 

 chotomous. 



b. Sporophylla proportionally short and broad, hardly 

 exceeding the sporangia. 



(188) S. Willdenowii. 

 b.h. Sporophylla proportionally long and narrow, distinctly 

 exceeding the sporangia. 



