70 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



of the erect branches, this species forms a connecting link between Ectocarpus and 

 Myrionema. 



Subgenus EUECTOCARPUS. 



Filaments inonosiphonus, erect, occasionally corticated by the growth 

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

 unilocular and plurilocular sporangia formed by the transformation of 

 special branches. 



E. tomentosus, (Huds.) Lyngb., Phyc. Brit., PI. 182. (Spongonema 

 tomentosum, Kiitz., Spec. Alg., p. 461; Tab. Phyc, Vol. V, 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 mm broad by .012-70 mm long; plurilocular 

 sporangia linear-o'dong, straight or incurved, .010-15 mm broad by 

 .025-75 mm 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, which is easily recoguizable by its spongy, rope-like habit, and by the 

 microscopic characters above enumerated, seems to be rather scarce on onr 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 alg;e. Only the plurilocular sporangia are known 

 on our coast. 



E. granulosus, (Eng. Bot.) Ag.; Phyc. Brit., PI. 200. 



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

 opposite or whorl ed, corticating filaments often numerous; cells .07-10 mm 

 . 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, .01-6 mm broad by .06-S m,u long, sessile on the ultimate and penulti- 

 mate branches ; unilocular sporangia ? 



Var. tenuis. {Ectocarpm Durkeei, Harv., Ner. Am. Bor., Vol. I, p. 

 112, PI. 12/.) 



Filaments more slender than in the type; cells .05-8 mra broad; 

 branches usually alternate ; plurilocular sporangia ovate or ellipsoidal, 

 but slightly truncate at the base. 



Boston, Harvey ; Newport, R. I. 



Var. tenuis, Portsmouth, K. H. ; Nantucket, 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 species occurs in summer, and forms small tufis oh 



