•"">v, i!.i(;.i ) i:m)(), notks ny M.ajr: m-:\v to .iaiwx, w ^47 



hcrl)ariiini s])ccimcii. Tlic slorilc cells, s^ciicrally very short and 

 biconcave, interjiosed ril irregular intervals in a hranch, remain 

 with (lark ^reen ehl()r(>])lasts ,t>'ivini^' an ai)i)e,'iraiK-e ol .'iniiulri- 

 tions to the filaments. I'iue transverse striations on the mem- 

 brane of the basal cells may be perceived under high magnifica- 

 tion. 



A stndy of the type s])ecimens of Conferva dun'iiscula and 

 Confcrvn cartilaginea in the IIer])arinm of the Academy of 

 Science of St. Petersburg, I can not find any legitimate difter- 

 ence between the two, except in the size of cells. Both forms 

 are represented in my specimens. In some of them, frond con- 

 sists of partly slender and partly robust filaments, and both 

 sorts of filaments start ramifying from one and the same root, 

 an evidence to justify the amalgamation of the two species 

 into one. It is, however, to be noted that the slender and the 

 roubst fihiments do not occur mixed on the same principal 

 l)ranch. 



The descri])tion of Spongomorpha duriuscula CoIvL. in Green 

 Algae of N. Amer., 1. c, appears to cover both Conf. duriuscula 

 RuPR. and Conf. cartilaginea Rupr. And what the same author 

 takes as Conf cartilaginea Ritpk. in the same work is surely 

 something else. Conf coalita Rupr. has nothing to do with 

 the present species. It is excellenth' represented by the specimens 

 as Phyc. Bor.-Amer., No. 819 and 922 under Cladophora scopas- 

 formis. Miss Tilden's Amer. Algae No. 373 under Cladophora 

 arcta, in the copy I have seen, should be also referred to it. 

 What she has distributed as No. 376 under CI. cartilaginea is 

 very likely CI. composita H. et H. 



The specimens from Bering Island and enlisted by Kjellman 

 under Cl. diffusa Harv. in his Beringhafvets Algflora, p. 55, now 

 preserved in the Botanical Museum of Upsala, comprise various 

 different species. One of them is nothing but Conf duriuscula. 



That the present plant belongs to Acrosiphonia J. Ag. has 

 been pointed out by Ruprkcht in his Tange, p. 4-01. Consult- 

 ing the systematic siu-vey on Acrosiphonia by Kjellman,^' I 



1) ■K.TEt.LMAN: Sludicr (ifvor Clilorophyccsliigtot Arrdi-iphonin. 1S9?. 



