66 



Class.— LYCOPODIN^. 



"^^ Type.-SELAGINELLA MARTENSII. 



s 



MOEPHOLOGY. 



Habit. — Creeping stems, dichotomo'n.sly branclied — 

 brandies all in one plane — bearing two kinds of 

 leaves, large and small. These are ligulate. The 

 large ones are inserted on the ventral surface, and the 

 small ones on the dorsal. One large and one small 

 leaf make a pair. The arrangement is decussate. 

 Besides the leafy branches, leafless ones — rhizophores 

 — are produced where the stem forks. These grow 

 downwards, and produce at their apices tufts of true 

 roots provided with caps. 



Growth. Grows by means of a four- sided 

 apical cell, which cuts off segments parallel to each 

 of the three sides which are imbedded in the sur- 

 rounding tissue. 



ANATOMY. 



Stem. Epidermis. Thickened outer cortex — thin 

 inner cortex — no intercellular spaces — (interrupted 

 by small leaf trace bundles) and the central cylinder 

 consists of either one or three vascular bundles. 



