― ^C9 ― 



Dudresnaya japonica Ok 謹. sp. nov. 



Mom, Jap. ； fli-lnrodo. 

 PL. XLI-XLIL 



Dudresnaya japonica Okam. y 本《；|43^^名,ひ， p. 92. 



jJiagiL Fronds very lubricous, almost cylindrical tlirou crht the 

 whole lenirth or the lower portions often decidedly compressed, 

 oraclually or abruptly tapering- below into a short stem, irregularly 

 dichotomous, here and there with tri-polychotoinous segments, t 5-30 

 cm. hi ゾ h， 3-5 mm. broad in thicker part. Branches vermiform stand- 

 ing at some distances, rising, from roundish or acute axils, gradually 

 taperino- above into slender and roundish apices. AiitJicridia trans- 

 formed from the cells of articulations of the peripheral filaments. 

 し、， docarps globular, slip-htly r en i form, beino- placed near the base of 

 peripheral filaments. Dioecious. Teirasporcs unknown. Colour red. 



hab. : Probably in calm waters. Cape Nomo (Pro v. Hizen), 

 Futaye (Isl. Amakusa), Prov. Shima, Prov. Sa し:'' ami. Fruit : ― Spring, 



Devclopuicnt of Cystocarp : I have been able to study nearly all 

 stages in the development of cystocarps from the procarp thoiiph 

 without any attempt to observe the internal nucleal changes. In 

 their o-eneral features, the fusion of the ooblastema filament and the 

 auxiliary-cell and the subsequent development of cystocarps very much 

 resemble those described and figured for Dudresnaya cocci nc a by 

 Bornet and Thuret and by Oltmanns ； more especially they resemble 

 those whicii have recently been studied by Howe in D. crassa Howe 

 Phycological Studies II， (Bull. Torr. Bot. Club, 32, 1905), p. 572, PL 

 28 and PL 29 fip". 12-26. 



PL.XLI-XLV, Nov. 190S. 



