THE rUC'ACE.E Ol' JAl'AX. 35 



liesitatingly referred this species to Cyslophylhun. No one will 

 iloiil)t that there is a very close relutionship between the present 

 species and Cyslophyllum crasslpes and that it may be found that 

 these two do not belong to different genera. 



In such species as Cystoseira erlcoides Ag., Cysioseira 3Iyrica 

 J. Ag., Cystoseira fibrosa Ag., etc., the vesicles are not limited 

 to the linal division of the ramulets, and certain portions of 

 vegetative organs are generally found above a vesicle. But in 

 Cystoseira Osmundacea Ag., Cystoseira fœniculacea Grev., Cysto- 

 seira squarrosa KuTZ., etc., the case, as in the present species, 

 is different : the vesicles are always on the terminal division of the 

 vegetative organs, and only the receptacles or the receptacular 

 branchlets may be found above a vesicle. In Cystophyllum gemi- 

 natwii the relative positions of receptacles and vesicles are some- 

 what indeterminate: in most cases the receptacles are above the 

 vesicles but not infrequently a vesicle may be found at the aj^ex 

 of a receptacle. Cf. also Kutzixg's Tab. Phyc. X. Taf. 52 fig. 

 2. under Cystoseira hypocarpa. 



I propose the following key to distinguish Cystoseira from 

 Cystophyllum : — 



Cystoseira : vesicles not restricted to the final divisions of 

 the vegetative organ. 



Cystophyllum : vesicles restricted to the final divisions of the 

 vegetative organ; only the recej^tacles or receptacular 

 ramulets may be above the vesicles. 



In accordance therewith Cystophyllum hakodatense may with- 

 out impropriety be assigned to the genus Cystophyllum and other 

 species such as Cystoseira Osmundacea Ag., Cystoseira fœniculacea 

 Ag., Cystoseira squarrosa Dj: Not. 'etc., should be transferred to 

 that genus. 



