53° 



BOTANICAL GAZETTE 



[DECEMBER 



face of the lateral strand, the two strands to the abortive spike are 

 very evident, with the long gap behind them. The gap is seen even 

 better in fig. 20, which shows also part of the adaxial face. Fig. 21 

 shows the adaxial face of the model with the two narrow strands 

 to the abortive spike obscuring the gap. Four such strands are 

 present in the petiole, but the model shows only one-half of the 





■ 

















19 



20 



21 



Figs. 19-21. — Photographs of model of the leaf traces on one side of the petiole 

 in region where strands to abortive spike originate; fig. 21, adaxial face. 



■ 



vascular supply. The pinnae of the leaves bearing the fertile spike 



abortive spike have two in all cases examined 



accompany 



The breaking up of the leaf traces into curved rows of bundles 



gularly in the petioles with 



does not occur 

 This condition 



described by Chrysler for Ophioglossum and Helminthostachys 



