22 



PSIliOTALES 



[CH. 



adaxial surface an elongated bilocular synangium attached to a 

 very short stalk (fig. 120, B). Reference has already been 



Fig. 120. Tmesipteris. A. Foliage leaves. 



B. Sporophyll and bilocular synangium. 



C. Diagram of transverse section of stele, px, protoxylem. 



D. F. Abnormal sporophylls. (From drawings made by Prof. 



Thomas and generously placed at my disposal. A.C.S.) 



E. Portion of C enlarged. 



made to the divergent opinions as to the morphological nature 

 of the sporophylls or sporangiophores, but recent investigations 



