- 135 - 



not changed in form. Cyslocarfls unknown. Co/our dark brownish and 

 almost black in dried state. Substance membranaceous and the plant 

 imperfectly adheres to paper in drying. 

 Hab. : Chishima (Kurile his.) 



PI. CLXXXV, Fig. 1-7. Fig. 1 : frond of /'tiroxifl/tow,/ hifrmuita 

 (P. et R.) Fkbg., }. Fig. 2 : terminal portion of branch, showing 

 alternate arrangement of pinnae, -"/-. Fig. 3 : contracted terminal 

 branches, -^-, Fig. 4 : growing point of branch ; a, apical cell ; />, //. 

 b", apices of lateral branches, ^p. Fig. 5 : cross-section of branch ; 

 compressed one is that of upper branch ; cylindrical one, lower, -^-. 

 Fig. 6 : longitudinal section of branch, -if F'g- 7 : branch bearing 

 tetraspores, --. 



Pterosiphonia arctica (J. Ag.) Setch. and Gardn. 



PL. CLXXXV, Fig. 8-16. 



Nom. Jap. : Inabo-gusa. 



Pterosifihonia arctica (J. Ag.) Setch. and Gardn. A!g. north-west. Arner, 

 p. 329.Polysiptwnia arctica J. Ag. Sp. II, p. 1034 ; Kjellm. Alg. A ret- 

 Sea p. 123. 



Only two ill-prepared specimens now before us. Frnnds filiform, 

 soft setaceous, complanated above, erect (?), dichotomo-pinnately branched 

 below, subfastigiately approximated above in subcorymbose manner. 

 Ramuli arise alternately at acute angles on slightly flexuose elongated 

 rachis, short, distichous, ending in an acute apices from broader bases. 

 Branches and ramuli are slightly united at base and stand intercepting 

 mostly two articulations. On the dorsal side of branches and branchlets 

 near their apical cells very short, almost rudimentary hairs are provided 



