No. 483] STUDIES OF THE OPHIOGLOSSACEAi 153 



bundles belonging to the lamina, of which the posterior one is 

 apparently the original abaxial bundle, while the others are de- 

 rived from the two outer of the four adaxial bundles. A large 

 specimen which was examined showed three bundles in a trans- 

 verse section of the peduncle (Fig. 11, D). 



Ophioderma. 



Bower has shown that in 0. pendulum, 0. simplex and 0. pal- 

 matum there is not a single leaf trace, but the individual strands 

 of the petiole join the vascular system of the rhizome directly. 

 He also showed that the adaxial bundles which supply the spike 

 in the fertile leaf of 0. pendulum are quite absent from the petiole 

 of the sterile leaf, which in section shows no bundles at all on the 

 adaxial side. In the section Ophioderma the upper part only of 

 the peduncle is free, the lower 



there are four adaxial biiiulles, '' '' 



evidently the result of a bifurcation of tlu^ two w Inch arc mm'h lower 

 down. The three abaxial bundles remain uiu luinuvd c\('c|.t that 

 they are somewhat ^J^^'^T^^^^^^^^^ Ijnm.lcnuig 



proicctiiiii' somcwliat froin the leaf and containing three bundles, 

 and the same mimbor occurs in the free portion of the pedun- 

 cle (Fig. 12, C & D). 



