HoLLOWAT. — Studies in the New Zealand Species of Lycopodium. 207 



in which a resting process is resuming its extension in length. Generally 

 it proceeds immediately to form paraphyses and antheridia (fig. 26), and 

 probably develops ultimately into a large prothallus. Thus these species are 

 able to propagate themselves vegetatively. In this connection it will be 

 remembered that Treub has described a rather different mode of vegetative 

 propagation in the prothallus of L. Phlegmaria. 



Fig. 31. — L. Billardieri var. gracile. Transverse section of a " resting " process. X 135. 

 Fig. 32. — L. Billardieri var. gracile. Longitudinal section of one of the apices of the 



" resting " process shown in fig. 25. X 13.5. 

 Fig. 33. — L. Billardieri. Longitudinal section of a very young lateral branch, x 135. , 

 Fig. 34. — L. Billardieri var. gracile. Longitudinal section of the generative region of 



the main prothallial body, showing suspensor, foot, and first root of plantlet 



in longitudinal section, x 42. 



Position of the Meristem. 



In the young prothallus of L. Billardieri var. gracile shown in fig. 9 it 

 : s apparent that the meristem is confined to the actual apex, and that more 

 than one of the apical cells are meristematic. This position and form of 

 the meristem holds throughout the life of the prothallus of this particular 

 type. In fig. 27 are shown the growing tips of lateral prothallial branches. 

 However irregular in shape the central body of the prothallus may be, there 

 is always a forward growing end to be found where the meristem is localized. 

 In the prothalli shown in figs. 2-5 the growing apex is easily to be distin- 

 guished, but it is not always so apparent. As I have mentioned above, the 

 rapid formation of sexual organs behind the growing apex generally brings 

 it about that the meristematic cells are somewhat displaced from the actual 

 apex of the prothallus and lie slightly towards the underside, this being 

 apparent in the longitudinal section shown in fig. 20. Again, I must add 



