S3 



THE BOTANICAL MAGAZINE. 



V.l XXXllI. No. 388. 



Monthly Mean Temperature of the Surface 

 Water at Takashima 



April 



1899 

 1900 

 1908 

 1902 

 1903 

 1904 

 1905 

 1906 

 1907 

 1908 

 1909 

 1910 

 1911 

 1912 

 1913 

 1914 

 1915 

 1916 

 1917 

 1U18 



7.2 



7.8 



7.7 



6.3 



8.8 



7.8 



5.6 



6.7 



G.9 



55 



6.9 



7.8 



6.4 



6.4. 



7.4 



7.5 



7.3 



6.1 



7.0 



6.7 



The water was changed every two da3'S with new, twice- 

 filtered'^ natural sea-water. 



The spores just liberated from the fronds sank down to the 

 bottom of the beaker and assumed spherical shape of 10-14 /^. 

 in diameter (Plate 1, fig. 1). It frequently happened to meet 

 with elliptical spores, but these seemed to be abnormal. (Plate 

 1, fig. 16). The nucleus is single in each spore sitting in its 

 center and within a chromoplast. The latter is arachnoidal, 

 the arms terminating at the inner surface of the sporangial 

 wall where the}' are more or less incrassated into sucker-shaped 

 knobs — in short, not much diftcrent from the chromoplasts in 

 the vegetative cells in the essential points. 



The spores began to germinate at the beginning of the 



]) A large funnel was taken, ils neck was packed with cotten for about an inch 

 near ils upper end. The water was filtered through the cotton. Tiiis arrangement 

 was found best for tlie purpose. 



