HoLLOWAT. — Studies in the New Zealand Species of Lycopodium. 279 



the foot on the first- formed protocorm proper, and the bases of the 

 two latest-formed protophylls. A transverse section of such a plant 

 through the thickest region of the plant-body reveals clearly the 

 original tuber and the later extension of it, but also shows that 

 internally the swollen bases of the third and fourth protophylls are 



foot 



foot 



Figs. 61, 62. — Lycopodium laterale. Transverse section of two such young 

 plants as shown in fig. 58. 61, X 60 ; 62, x 35. 



completely fused, although externally they can be distinguished (figs. 61 

 and 62). In no case was the prothallus found still attached to a young 

 plant which bore more than the two original protophylls. The plant- 

 body continues to grow sideways owing to the lateral development of 

 new protophylls (figs. 63-65). In the majority of the young develop- 

 ing plants that were examined it was observed that the first-formed 

 protocorm proper could clearly be distinguished from the later-formed 

 protocormous extension, there being a well-marked constriction between 



63 

 Figs. 63-65. 



-Lycopodium laterale. Young plants, showing further extension of the 

 protocorm. X 12. 



the two parts (figs. 64 and 65). In the cleaning process the two portions 

 in not a few cases broke away from each other. The protocormous 

 rhizome continues to elongate laterally, owing to the further development 

 of protophylls, till there are as many as eight to twelve of the latter. 

 The protophylls arise in pairs, and in many cases they are arranged in 

 two more or less distinct rows along the dorsal side of tlie rhizome. 

 Ihis, of course, indicates that their development, and so also that of' 

 the whole plant-body, has taken place very regularly. The rhizome is. 



