1917] Gardner: New Pacific Coast Marine Algae I 403 



gonimoblasts similar to those mentioned above for N. ramulosum, but 

 not so numerous and long as those in that species. NemaUon is placed 

 in the section Nemalieae of Helminthocladiaceae by Schmitz and 

 Hauptfleisch, while Dennonema is placed in the Dermonemeae of 

 the same family by the same authors. From the standpoint of the 

 development of the gonimoblasts, Dermonema dichotomiun might pos- 

 sibly be joined to the series of species of NemaUon. The gonimoblastic 

 filaments in D. clichotommn arise after the fertilized carpogonium 

 has divided several times as in the genus NemaUon, but instead of 

 forming a compact mass the}" ramify horizontally among the cortical 

 filaments for some distance and give off erect branches which bear 

 the carpospores, making a diffuse cystocarp as in Cumagloia Ander- 

 sonii. If it were not for the fact that the gonimoblasts in Cumagloia 

 arise directly from the fertilized carpogonium it might well stand in 

 the series between NemaUon and Dermonema, since the gonimoblasts 

 are less diffuse than those of the latter and less compact than those 

 of the former. We are now brought to the position, as we frequently 

 are in the study of genetic relationships, from which we must choose 

 one of two alternatives in our method of treatment of the subject. 

 AVe must either amend and combine or segregate and describe anew. 

 In the present instance it has seemed best to follow the general tend- 

 ency and adopt the latter course. 



Before leaving the subject it seems well to point out the similarity 

 between CumagoUa and HarveyeUa mirahiUs Schmitz and Reinke. 

 Cumagloia agrees with HarveyeUa in not having the gonimoblasts 

 compact and definitel}' set off from the surrounding sterile tissue, but 

 in having the intermingling of gonimoblasts and cortical filaments. 

 Schmitz assigned HarveyeUa to the family Gelidiaceae among the 

 Xemalionales. Tliis family is characterized by Schmitz in part as 

 follows: ''Die bcfruchtete Eizelle sprosst vielfach iiarli Fusion mit 

 einer oder mehreren benachbarten Zellen zum Gonimoblasten aus. " 

 In Gigartinaceae, however, the fertilized egg fuses with a distinct 

 auxiliar}^ cell which has previously been formed. The auxiliary cell 

 then gives rise to the gonimoblasts. Sturch found that HarveyeUa 

 miral}iUs shows fusion between the carpogonium and an auxiliary cell 

 which had been formed previous to fertilization, and that the gonimo- 

 blasts arise from the auxiliary cell. lie saj's, "The genus HarveyeUa, 

 which possesses an auxiliar}' cell developed before fertilization, must 

 therefore be removed from the Gelidiaceae and may be placed in the 



