PTERIDOPHYTA. 



A.-LYCOPODIN.E. 



I. 

 SELAGINELLA MARTENSII. 



SPOROPHORE. 



I. In a well-grown plant note with the naked eye 

 the following external characters : 



(1.) The Stem ascending, frequently branched, appa- 

 rently in a dichotomous, but really in a monopodial 

 manner (see below ) ; the branching occurs only in a 

 single plane. 



(2.) The Leaves simple in form, with a ciliate margin, 

 and arranged in alternating pairs; each pair consists 

 of a dorsal and a ventral leaf, the whole series thus 

 forming four orthostichies : note the two different 

 sizes of leaves 



a. The larger ventral leaves, arranged in two 

 orthostichies, without terminal awns. 



b. The smaller dorsal leaves, also arranged in two 

 orthostichies, each leaf being terminated by a fine 

 Awn. 



Each leaf has a single central nerve or Midrib. 

 Turn back one of the leaves, and observe with a lens 



