1903.] THREE NEW MARINE ALQJE FROM JAPAN. 101 



in the lamina cover the whole costal region except at the basal portion. 

 The sporophyll begins to appear. 



I took out 16 plants at random from the material sent and measured 

 as following table. They are arranged in order of the shape of the base 



ot tl 



lie iamma. 





stem. 



lamina 





No. 



Sharpe of base. 



Lengtli 



Breadth. 



Length 



Breadth 



1. 



Gently tapering 



.5. cm. 



0.8 cm. 



62 cm. 



17 cm. 



2. 



Tapering. 



7. 



1.2 



51 



14 



3. 



7> 



6. 



1.2 



73 



19 



4. 



Acute 



14. 



1.6 



92 



28 



5. 



jj 



11. 



1.3 



72 



17 



6. 



Near to <R. 



11, 



1.3 



82 



24 



7. 



7J 



8. 



1.4 



63 



16 



8. 



?? 



4.5 



0.9 



46 



16 



9. 



Risiht anojled 



4. 



1.4 



p iu^:? 



24 



10. 



?? 



8. 



1.6 



51 



24 



11. 



Round 



0.5 



1. 



83 



33 



12. 



J5 



2.5 



2. 



75 



42 



13. 



Subcordate 



0.5 



1.2 



60 



26 . 



14. 



Cordate 



1. 



p ^'A 



83 



34 



15 



;j 



1.5 



0.7 



82 



33 



16 



?5 



2.2 



2. 



76 



36 



This proves that after the plant has grown up to its full length the 

 transition region, attenuating below first, begins to expand both sides 

 adding the breadth to the basal portion of the lamina. The edges of the 

 ancipitate stipe play the important part of the process. The expanding 

 continues downward till it effects a broad cordate base, leaving a little 

 portion of the stipe to admit the sporoph}^]!. In two cases the stipe is as 

 short as half centimeter. Hence the foldings of the sporophyll is naturally 

 limited to a few number 



The sporangia both of the sori of the sporophyll and the lamina do 

 not show much divergency. Those in the former, however, seem to exceed 

 the latter in length ; and the chromatophore in the paraphyses of the 

 former was exceptionally granular while it was compact hyalin mass in 

 the latter. The mucilageneous mass is capping the apex of each paraphysis. 

 Compare fig. 7 & 8. 



* Furnished with sporophyll. 

 "^^ Upper portion torn ofF. 



