278 



Transactions. 



merit the young plant is very similar 

 consists of a basal tuberous protocorm 



protophylls, and is 

 ■\vhich can clearly 

 (figs. U-16). Tlie 

 colour, and stomata 

 rous long rhizoids. 

 L. later ale differs 



to that uf L. cernuum. It 



surmounted by one or two 



connected with its parent prothallus by a foot 



be distinguished through the prothallial tissues 



protocorm and protophylls are a vivid green in 



occur on the latter. The protocorm bears nume- 



From this stage onwards the young plant of 



in its development from what normally takes place 



Figs. 54-56. — Lycopodium laterale. Young plants, showing beginning of extension of 



protocorm. X 16. 

 Tig. 57. — Lycopodium laterale. Young plant shown in fig. 56 ; side view. X 16. 

 Fig. 58. — Lycopodmm laterale. Young plant with four protophylls. x 16. 

 Fig. 59. — Lycopodium laterale. Young plant shown in fig. 58 ; the latest-formed 



protophylls in end view. X 16. 

 Fig. 60. — Lycopodium, laterale. Young plant shown in fig. 58 ; underneath view. X 16. 



in the case of L. cernuum. The third protophyll arises in a lateral 

 position (fig. 54), and Avhen it is full-grown its base shows as a swelling 

 clearly to be distinguished from the original protocormous tuber (figs. 55 

 and 56). In fig. 57 the young plant shown in fig. 56 is depicted in a 

 sideways position, in which the two distinct swellings are clearly seen. 

 The fourth protophyll arises alongside the third, and forms a pair with 

 it (fig. 58). Here again it is to be observed that the swollen bases 

 of these two protophylls are distinct from one another. In fig. 59 are 

 shown in end view the two latest-formed members of the plant illus- 

 trated in fig. 58. Fig. 60 is an under view of the same plant, showing 



