April wis.] YENLO. -NOTES ON ALGM NEW TO JAPAN. VJH. 73 



This Alediterranean species stands close by the Australian 

 species Dasya hapalathrix Harv. Both are hardlv separable by 

 the descriptions only. The pinnate ramification of D. hapalath- 

 rix illustrated by Harvey in Phvc. Austr., PI. 88 is shown too 

 regular than the original specimen actually reveals. The essential 

 point to separate the two appears to me to lie on the spinulat- 

 ed or naked principal stems. 



Locality. Otaru Bay (!). 



Distribution. Alediterranean Sea. 



Polysiphonia macrocarpa Harv. 



in MacKav: Flora Hibernica, II, p. 206. — Cotton: Clare Isl. 

 Surv., Mar. Alg., p. 138. 



The specimens at my disposal are rather small, measuring 

 but 10— 15 mm in height, and are all tetrasporic. Examining 

 the plant and referring to the description I could not do other- 

 wise than to bring them to P. seriularioides J. Ag., under which 

 various species have been synonymized. A comparison of ours 

 with the authentic specimens of the latter I found to agree 

 exactly in every respect with a specimen sent from Cotton 

 under P. macrocarpa Harv. Cotypes of P. acanthophora KiJTZ. 

 and P. grisea Kutz., which are also regarded to be nothing but 

 P. sertularioides J. Ac, show various characters divergent from 

 them. I choose, therefore, to take J. Agardh's species in the 

 narrow sense and to follow Cotton who prefers to count the 

 species as valid after Batter's view. 



The prostrate part of frond consists of thick-walled, cuboidal 

 cells, i.e., with the articuli about half as short as diameter. 

 The erect filaments consist of the articuli, except in the basal 

 part, of 2—4 times as long as the diameter and the stichidial 

 branches have the articuli nearly as thick as diameter. There 

 are very lew branches, ascending and elongated, which may be 

 stichidifcrous in the upper portions. Short spinous ramulcts 

 are frequently met with in the middle parts of the principal 

 filaments. 



Locality. Shiriya Cape, Mutsu I'rov. (Kosi \i\\\ m). 



Distribution. England. 



