4 BOTANICAL MAGAZINE. LVoi.xvii, 



other groups of algae, there are not-less instances of vegetative multiplication, 

 such as Bryopsisp Catderpa^^ etc. among Chlorophyceae, and Zonarta, 

 Sphacelaria and others among PhaeopJiyceae. It should have been rather 

 strange, if so widely existing mode of multipHcation were not known among 

 Florideae alone. Very recently, w^e have learned by Tobler's observation 

 on Dasya ehgans^^ that the hairs and branchlets of that alga. had been 

 broken into their component ceils by exposing the plant to hght at window 

 and those cells had been cultivated by that author to germs of 7-8 mm. 

 in length. This may be taken as an extraordinary case of propagation 

 though it is not true vegetative multiplication. 



With respect to the systematic position of this alga, J. Agardh"*^ doubts 

 its affinity with Chondria and excludes it from that genus. He inclines 

 to place it rather in the genus Ghrysymeniay based on the habit and structure. 

 The same author says that, in cutting transverse section, the frond is 

 tubular, whose interior is percursed by slender and anastomosing filaments. 

 He mentions neither the central axis nor pericentral cells. But from what 

 has been already described, one will not certainly deny this plant to be 

 placed in Chondria, The material by which that author has made his study 

 is said to be the original specimen. Our specimens of Chondria crassicaidis 

 Harv., which have been put in my "Algae Japonicae Exsiccatae^- Fasc. I 

 No. 23, have been determined in comparison with another original specira- 

 en'') which had been collected by C. Wright at this country, and distributed 

 from " Herbarium of the U. S. North Pacific Exploring Expedition under 

 Commanders Kinggold and Rodgers, 1853-56." For the sake of demon- 

 stration, I shall here briefly describe the plant in question with regard to 

 its shape and structure. 



]). Noll, F. — Experimentelle Untersucliungen iiber das Wachsthnra cler Zellmembran 

 [Habilitationssclirift] (ref. Bot. Centralbl. Bd. 33. 1888 p. 103). 



2). Wakker, J. H. — Die Neubildungen an abgeschuittenen Blattern von Caulerpa' 

 prolifera. (ref. Bot. Centralbl. Bd. 33. 1&88. p. 163). 



2). Janse, J. M. — Die Bewegungen des Proto plasma von Caulerpa prolifera. (Pringsheim's 

 Jahrb. f. wissens. Bot. Bd. XXI. 1889. p. 166 ff.) 



2). Klemm, P. — Ueber Caulerpa prolifera. Ein Beitrag zur Erforscliung der form- und 

 Riclitkrlifte in Pflanzen (Flora. 1893. p. 477). 



3\ Tobler, F. — Zerfall und Eeproduktionsvermogen des Thallus einer Ehodoraelaceae. 

 (Ber. d. Dentsch. Bot. Gesellsch. Bd. XX. 1902. p. 357-365. 1 taf.) 



4). J. Agardh.— Analecta Algologica. 1892. p. 161. 



5). This specimen is kept in the Herbarium of the Imperial University in Tokyo, 



