6 HOLDKN, Abnonnal specivieiis of Dictyota dichotonia. 



violacea collected by him at Port Erin the production of 

 sexual and asexual reproductive organs upon the same 

 plant is by no means rare. 



1 understand that the cytology of these forms is at 

 present being studied in the Hartley Botanical Labora- 

 tories, Liverpool, so that we may hope, in the near future, 

 for a definite solution of the fascinating problems raised 

 by their occurrence. 



BIBLIOGRAPHY. 



(1) Bower, F. O. "The Origin of a Land Flora," Chaps. IV. 



and V. London, i 90S. 



(2) Hakvky-Gii!SON, R. J. and Others. "Observations on 



the Marine Alga^ of the L. M. B. C District," Trans. 

 Liverpool Biol. Soc, XXVII., 191 3. 



(3) Lloyd-Wili.iams, J. "Studies in the Dictyotacese," I., 



Ann. Bot.^ iS. (January) 1904. 



(4) . "Studies in the Dictyotaceae," II., Ann. Bot, 18 



(April) 1904. 



(5) . "Studies in the Dictyotaceae," III., Ann.Bot.^\^. 



1905. 



(6) Yamanouchi, S. "The Life History uf Folysiphonia 



violacea,^' Bot. Gaz., 42. 1906. 



