70 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



of tho erect branches, tliis species forms a couuecting link "betweeu Ectocarpus and 

 Myrionema. 



Subgenus EUECTOCARPUS. 



Filaments moiiosiplionus, erect, occasionally corticated by the gro\Yth 

 of descending filaments wliich are given off from some of the cells ; both 

 unilocular and plurilocular sporangia formed by the transformation of 

 special branches. 



E. TOMENTOSUS, (Hiids.) Lyngb., Phyc. Brit., PI. 182. {Spongonema 

 tomentosiim, Kiitz., Spec. Alg., p. 4G1; Tab. Phj'C, Vol. Y, PI. 83 a.) 



Filaments erect, two to four inches long, densely interwoven into 

 rope-like, spongy masses, irregularly much branched; primary branches 

 scarcely distinct; cells .008-12'^"" broad by .012-70'^'" long; plurilocular 

 sporangia linear-oblong, straight or incurved, .010-15 """^ broad by 

 .025-75™'" long, sessile or on short pedicels, which are given off at right 

 angles to the branches; unilocular sporangia '^subovate on short 

 pedicels" (Areschoug). 



On Fucus and other plants. 



Boston Bay, Harvey; Magnolia, Mass.; Europe. 



This species, wliich is easily recognizable by its spongy, rope-like habit, and by the 

 microscox)ic characters above enumerated, seems to be rather scarce on our coast. It 

 is not rare, however, on the shores of Europe. The species is to be sought in summer, 

 and it grows attached to the larger algie. Only the plurilocular sporangia are known 

 on our coast. 



E. GRANULOSUS, (Eug. Bot.) Ag. ; Phj'c. Brit., PI. 200. 



Filaments tufted, rather rigid, two to four inches long, main branches 

 opposite or whorled, corticating filaments often numerous; cells .07-10'""* 

 in diameter ; secondary branches short, opposite, given off at very wide 

 angles, often revolute at the tip ; ultimate branches secund, short, acute ; 

 plurilocular sporangia broadly ovate, obliquely truncate on the inner 

 side, .01-G'^'^^ broad by .00-8"°^ long, sessile on the ultimate and penulti- 

 mate branches ; unilocular sporangia ? 



Yar. TENUIS. (Ectocarpits DurJceeij Harv., Xer. Am. Bor., Yol. I, p. 

 112, PI. 12/.) 



Filaments more slender than in the type; cells .05-8'"'^ broad; 

 branches usually alternate ; plurilocular sporangia ovate or ellipsoidal, 

 but slightly truncate at the base. 



Boston, Harvey ; Newport, E. I. 



Yar. tenuis^ Portsmouth, K. H. ; Xantucketj Mass., Harvey; Wood's 

 Holl, Mass. 



A species not rare in Europe and apparently common on the coast of California, but 

 not often found with us. The sx)ecies occurs in summer, and forms small tufts on 



