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Transactions. 



the prothallus of L. salakense. In 1902 Thomas (12) published a pre- 

 liminary account of the prothallus of Phylloglossum. In 1910 (6) I noted 

 the fact that I had found the prothalli of both L. cernuum and L. laterale 

 in) New Zealand, and stated that the latter was of the cernuum type. In 

 Part I of the present series of papers (7) I described and figured the 

 external form of the prothalli and the structure of the young plant of 



Fig. 38. — L. cernuum. Prothallus showing in general view lower part of shaft with 



two fungal regions, x 32. 

 Fig. 39. — L. cernuum. Longitudinal section of prothallus shown in fig. 38. X 32. 

 Fig. 40. — L. cernuum. Longitudinal section of prothallus, showing double basal tubercle 



and thick, short shaft. X 50. 

 Fig. 4L — L. cernuum. Longitudinal section of upper fungal region of a prothallus, with 



lateral group of lobes. X 50. 



both these species, and also of L. ramulosum., noting especially the variations 

 in form to be found in the prothallus of the latter. In 1917 Chamberlain (3) 

 gave a brief description, with figures, of the prothallus and young plant of 

 L. laterale from material which he had obtained in New Zealand. Lastly, 

 in a third Part (9) I have enumerated the main results of my study of the 

 three New Zealand species which belong to the Cernua section in connection 

 with the plasticity to be observed in the genus as a whole. 



