APPENDIX 635 



Ferns, as well as the Eusporangiatae, the vascular system of the axis 

 is composed entirely of united leaf-traces. Should this be so, the 

 bundle found in the stem-quadrant of the embryo would belong to 

 the second leaf and not to the stem itself. 



P. 328. A very elaborate study of the vascular system of the 

 Ferns has been published recently by Tansley (2). This, like all of 

 the similar work of late years, is based on the assumption that the 

 stelar structures of the axis are of cauline origin. 



P. 342. For "Goebel (10)," read ''(9)." 



CHAPTER X 



P. 346. Boodle (8) has observed much reduced male prothallia 

 of Todea, developed from spores which germinated within the closed 

 sporangium, where the latter were prevented from opening on 

 account of excessive moisture. 



P. 360. The most recent study of the structure of the vascular 

 system in the Osmundaceae has been made by Sinnott (i). This is 

 principally concerned with the question of the formation of foHar 

 gaps. These were found to be present in all cases, although often 

 inconspicuous. 



P. 366. The writer has investigated the gametophyte in several 

 species of Gleichenia, i.e., G. polypodioides, G. pectinata, G. dichotoma 

 {G. linearis), and G. laevigata. The first species belongs to the section 

 Eugleichenia, the others to Mertensia. G. polypodioides, which was 

 collected near Cape Town, has a smaller prothallium than the other 

 species, and one which more nearly resembles that of the Polypodiaceae 

 in form; while the other species have the prothallium often much 

 elongated, or with a conspicuous midrib, much as in Osmunda. In 

 these species, too, there are more or less conspicuous leaf-Hke lobes, 

 so that the prothaUium closely resembles such a Liverwort as Fossom- 

 hronia. The larger prothallia are sometimes dichotomously branched. 



The antheridia are usually confined to the ventral surface of the 

 gametophyte, but in G. Icevigata they may also occur upon the dorsal 

 surface of the midrib. 



In the older gametophytes there was always found an endophytic 

 fungus, like that occurring in the Marattiaceae and Ophioglossaceae. 



The antheridium of Gleichenia polypodioides was found to correspond 

 most nearly with that of the species studied by Rauwenhoff ; in the 

 other species the antheridium is very much larger, and closely re- 



