476 



BOTANICAL GAZETTE 



[JUNE 



Fig. I . — Cell of somewhat 

 intermediate character sur- 

 rounded by ordinary gameto- 

 phyte cells; X210. 



{m, m', m"), of the nature of secondary prothallia, had also been 

 produced from the tenninal gametophytic portion. 



The lamina of the leaf in some cases was wholly absent, the 

 petiole being, however, well developed and resembling that of an 



ordinary leaf (fig. 16). From the ventral 

 surface of each of the two large terminal 

 gametophytic portions {b, c) numerous 

 antheridia ia) had been formed. From 

 the dorsal surface of one of the prothallial 

 portions {h) two small secondary pro- 

 thallia {m, m) had begun their develop- 

 ment. The vascular system, which was 

 generally well developed in this portion 

 of the embryo sporophyte, extended 

 for some distance into the terminal 

 gametophytic portion. Between the 

 gametophytic and sporophytic portions 

 the cells were of an intermediate character, as shown in fig. 2, w^hich 

 is a highly magnified portion taken at t. From the petiole of the 

 same sporophyte a prothallial portion (p) had been produced. This 

 outgrowth bears no relation to the vascular system of the petiole. 

 The much modified primary 

 leaf just described was devel- 

 oped in connection with a root 

 and normal secondary leaves. 

 A structure similar to the 

 preceding one is represented 

 by fig. 8. The petiole ap- 

 peared to be well developed 

 but both lamina and root were 

 absent. The terminal portion 

 was also distinctly gameto- 

 phytic in nature and on both 

 surfaces numerous antheridia 



{a) of different sizes and secondary prothalHa had been produced. 



An interesting form is represented by fig. 13, since the single 



large gametophytic portion has been produced in connection with 



Fig. 2. — Peculiar cells, intermediate in 

 character, of Pteris sulcata; X162. 



