150 THE AMHRICAX XATi h'ALIST [Vol. XLI 



part of the petiole of Ophioglossum sp., 

 X 25; A,B,at the base; C, higher up. 



pass into the spike, the main 

 trunks passing upward into the 

 lamina. In the specimen shown 

 in Fig. 8, w^hich probably was not 

 the typical 0. moluccanum, while 

 the leaf trace divides into two 

 branches, as in 0. lusitanicum, 

 only one of these divided at the 

 base of the leaf, so that at a point 

 some distance above the base 

 there are only tliree bundles, two 

 of which are destined for the 

 spike. The single bundle which 

 is to supply the lamina is the 

 result of the division of one of the 

 two primary strands, the other half 

 of which forms one of the adaxial 

 bundles belonging to the spike. 



O. MOLUCCANUM SCHLECilT. 



A transverse section of the petiole in the typical O. moluccanum^ 

 made some distance below the point of separation of the two 

 parts of the sporophyll (Fig. 9, A), shows four nearly equal vascular 

 bundles, of which one is on the outer (abaxial) side, the other 

 three on the adaxial side. As in all other species of Euophio- 

 glossum, these bundles are markedly collateral in structure. It 

 is probable that the central adaxial bundle is due to the branching 

 of one of the two adaxial bundles found near the base of the 

 petiole. 



If a section be made just below the point where ihv two j)arts 

 of the leaf separate (Fig. 9, B), the three adaxial l.midlcs aiv still 

 recognizable, but the abaxial one has divided into several, which 



taken a little higluM- up <(\ >l,ous plainly the Wa.es of the hv.. 

 parts of the leaf. In tin- a-laxial paft. the pe.hinel.> of tin- spike, 

 the original tluve a-laxial l.nn.iles. are clearly evident, while in 



