30 THE BOTANICAL MAGAZINE. [Vol. xxxn. No. 37c. 



:rS^-ti 



ever, have the proliferating branchlets poorly developed and 

 even entirely absent. On this character there is nothing stated 

 by the former writers. 



Petersen states that the present forma "is perhaps rather 

 to be considered as a species ; at all events it is nearer to be a 

 species than the other." I agree with him on this view. This 

 forma is sharply limited from the other numerous formae by 

 the peculiar mode of ramification. Foslie, I.e., observes a 

 transition form between this and f. corymbifera, and also some, 

 between this and f. genuina. 



It is interesting to note that this forma is very common in 

 the colder waters about Japan but hitherto never found on the 

 coasts washed by the Black Current. 



C. involutum Kutz., judging from the figures in Tab. Phyc, 

 I.e., appears to me to be identical with this forma. Kutzing's 

 plant is not described to have the proliferating branchlets. 



Locality. Rishiri Island, Kitami Prov.(!); Oshoro by the 

 Otaru Bay(!); Kominato, Mutsu Prov. (T. Tomomichi); Muro- 

 ran(!); Kushiro (T. Kawakami); Nemuro(!); Rubetsu, Etorofu 

 Island(!);Motoyoshi(!),DaitoCape(!), Shobuta (Dr. A. Yasuda), 

 Rikuzen P-rov.; Chosen, Corea (N. Takahashi). 



f. corymbifera J. Ag. 



Spec. Alg., Ill, p. 100.— Foslie: Norw. Forms of Ceram., p. 15, 

 PI. 3, fig. 6. 

 ? = Ceramium irregulare Kutz.: Tab. Phyc, XIII, Taf. 10, fig. II. 



This form stands close by the preceding from which, how- 

 ever, it may be distinguished by having less forcipated apices. 

 Tetrasporangia are richly found in the upper ramulets, arranged 

 in much disturbed rings around the genicula. The tetrasporic 

 form has a peculiarity in the mode of ramification. The upper 

 principal branches ramify in one plane in a decompound- 

 paniculate manner, the general outline assuming an ovate 

 Shape. The proliferating ramulets are very few in number. 

 Some of the tetrasporic specimens with abbreviated ramulets 



