JOURNAL OF THE COLLEGE OF SCIENCE, TOKYO IMPERIAL UNIVERSITY. 



Vol. XXXII., Art. 9. 



Oogonium Liberation 



and 



the Embryogeny of Some Fucaceous Algae. 



By 



M. Tahara, Fdijakushi. 



With o Plates and 5 Text Fvjures. 



It had long been my wish to make some biological as well as 

 cytological observations on the representative members of Japanese 

 Fucaceae, as om* knowledge of this family especially in respect of 

 these points is still very imperfect. 



Taking the opportunity of a short stay at the Misaki Marine 

 Biological Station of the Tokyo Imperial University in the winter 

 of 1908-1909, I made some observations on Sargasswn, especially 

 on the liberation phenomena of oogonia. The results were 

 published in a preliminary note in the Botanical Magazine, Tokyo, 

 Vol. XXIII. 1909. 



To carry out more extensive studies, I made a second visit to 

 the station at the end of December, 1909 and stayed there for 

 about three months. The present paper presents the results of 

 that visit. The substance of it was reported on the 28th of April, 

 1910, before a meeting of the Tokyo Botanical Society^^; and 

 briefer accounts were given in Japanese in the Bot. Mag. Tokyo. 

 VoL XXV. 1911. 



According to Yendo's well known monograph on Japanese 

 Fucaceae'^ there are eight genera of this family in Japan, namely, 

 Fiicits, Pelietia^, Ishige^, Cystoseira^ Cystophyllum, Coccophora, Turbi- 



1) Proceedings of the Tokyo Bot. Society. Bot. Mag. Vol. XXIV., P. (246). 



2) Yendo, The Fucaceae of Japan. Journ. Coll. Sei., Imp. Univ. Tokyo. Vol. XXI., 

 Art. 12. 



