TITE FUrACE.T: or .TAPAX. 101 



H torii-oH' onil." This is not, in many cases, a result of regenera- 

 tion on a wounded part, but is a Nvitches' broom caused by certain 

 endophytic alga. In Fucus evaiiescem, liowever, differently from 

 ours, tlio lirooni branches are similar in shape to the principal 

 frond. Tt is a widely known fact that some flowei-ing plants, such 

 as Abies, Fyuphorbia, etc., when attacked by ]mrasitic fungi, 

 undergo a considerable modification in the mode of ramification 

 as well as in the shape of the leaves. So far as the knowledge 

 of the present writer extends, no example parallel to our case 

 has ever been recorded from the algae. More details on this 

 subject, I hope to present in another paper. 



Systematic position of the species. On what grounds Oka- 

 MURA has identified this plant with Pelvetia {Fucus) Babingtonii 

 Harv. is not satisfactorily clear to me ; it might have been because 

 this is the only plant on the Pacific coast of middle Japan, whose 

 structure has a certain resemblance to Pelvetia. Judging from the 

 remark made by him in Enumer. Alg. of Jap. p. 137, he seems 

 to have laid too much stress on the locality of Pelvetia Babingtonii 

 Hary. mentioned by the original author. And he seems to have 

 believed the foliose type to belong to other species. There is 

 very little ground for referring this species to the genus Pelvetia, 

 but we have many points separating it from that genus. 



The characters of the cryptostomata in foliose type exactly 

 answer to those of the other Fucaceous genera hitherto studied 

 (PL II, fig. 8). Cf. the figures of the cryptostoma of Sargassum 

 filipendula newdy illustrated by Simoxs.^^ 



Although MuRRAY^^ seems to have differed from Oltmanns's 



1) Cf. Saunders: Harrimak's Alaska expedition. PI. LXII, fig. 1. 



2) A morphol. study of Sarg, filip. PI. X. fig. 22. Tlie Bot. Gazette, vol. 49. 190G. 



3) Phyc. Memoir. Part. II. p. 30. 



