― 174 一 



Halymema acuminata (Holm.) J. Ag. 



Norn. Jap. : O-niukade-nori. 

 •• PL. XXXV, Fig. 6-12. 



Halymcnia acuminata (Holm.) J'. A^. Sp. Al ふ Vol. Ill, part 4. 1901" 

 p. 130. ― Gratclonpia acuminata Holm. On Mar. Alg. fr. Japan, 1895 

 (Linn, So に Bot. Vol. XXXI) p. 254， t， X， f. 2a-c ； De Toni Syll. Al ま. 

 IV， p. 1559; Okam. Alg. Jap. Exsic. (H 本 海藻 標品） Fasc, I， no. 31;' 

 岡 村， 日本 藻類 名 ま t P. S9. 



Hah, ： Probably in low tide, linoshima (Prov. oagami). 

 Fruits : ~ spring. 



Plant attains the length of 4o-60 cm. with the breadth of 4-6 cm. 

 In robust forms, branches having similar shape as the remaining densely 

 proliferate from both surfaces of the main segment. Plant firmly adheres 

 to paper in drying. 



The present plant wnicn has been suspected by Holmes to belong 

 to Halynieuia from the structure of frond has been afterward considered 

 by J. Agardh to. be placed under that genus in the section Acanfhymeniae 

 J. Ag. /. c. 



PL. XXXV, Fig. 6-12. Fig. 6： fructified frond of Halymema 

 acuminata (Holm.) J. Ag., \, — Fig. 7 : cortical portion of frond, showing, 

 the structure, さ. ず 々• ― Fig, 8 ： portion of the cross-section of frond bearing 

 tetrasporangia, —— Fig. 9 : aj),c, cells of procarpial branch ； s,s\ sterile- 

 cell branches : d, carrying cell, ^y^. ― Fig. 10: cross-section of frond bear- 

 ing cystocarps, -. ― Fig. 11 ： cystocarp, -^. ― Fig. 12 ： cystocarp, -—. — 

 Fig. 12 ： central cell cut otl from fused cell, f. ^ 



