72 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



B. fascictjlatus, Harv. 



Filaments one to eight inches long, erect, tufted, entangled below 

 but free and feathery above; cells of main branches .05 rara in diameter, 

 about as long as broad ; secondary branches alternate, short, given off 

 at an obtuse angle; ultimate branches very numerous, secund, ending in 

 a hair; plurilocular sporangia ovate-acuminate or subulate, sessile or 

 on short stalks, borne principally on the upper side of the penultimate 

 branches, very variable in size, but averaging from .018-25 mm broad by 

 .070-150 mm long ; unilocular sporangia sessile, oval, .04-G mm by .OS-iS""". 



Very common on the larger algse along the whol e coast ; Europe. 



When found in its typical form the present species is easily recognized, but it varies 

 considerably, so that the extreme forms are not easily determined. It is very common 

 on fronds of Lamlnarla and other large Phceosporece, on which it forms a dense fringe 

 one or two inches high. The larger forms are much looser and feathery and the tips 

 of the branches are fasciculate when seen with the naked eye. When long and slender 

 it becomes the var. draparnaldioides of Crouan. The most puzzling forms are those in 

 which the filaments are short and thick and the rather stout plurilocular sporangia 

 are arranged without order on the branches. In this species the unilocular and pluri- 

 locular sporangia are more frequently found growing together on the same individual 

 than in any of the other species found on our coast. 



B. lutosus, Harv., Ner. Am. Bor., Vol. I, p. 140, PI. 12 a. 



Filaments tufted, two to four inches long, densely interwoven in 

 spongy masses ; low'er branches opposite, .03-4 mm broad; upper branches 

 irregular, ending in long hairs; plurilocular sporangia .04-5 mm broad 

 by .15-20 mm long, cylindrical in outline, ending in very long hairs, which 

 occasionally fork ; unilocular sporangia ? 



Greenport, L. I., Harvey; Wood's Holl, Mass. 



The above description is taken from a species common on Fucus at Wood's Holl, in 

 May, 1876, which corresponds very well to the E. lutosus of the Nereis Am. Bor., a 

 species which Harvey states is not clearly defined. It differs from the description 

 given by Harvey in the fact that the sporangia are not very long, and it is not im- 

 possible that our plant may not be the same as that described by Harvey. The present 

 species, as we understand it, is short and tufted and the filaments are densely inter, 

 woven into rope-like masses as in E. tonientosus,. The species seem to connect 

 Pylaiella with Euectocarpus, resembling on the one hand E. siliculosus var. hiemalis, 

 and on the other E. firmus. From the former it differs in the branching and the 

 shape of the plurilocular sporangia, which are strictly cylindrical, never being in the 

 least acuminate. From the latter it differs in being more slender and in having the 

 sporangia always at the base of very long hairs, which sometimes branch, and not in 

 the continuity of the branches themselves. The ramification is very bike that of 

 E. firmus. In drying the species becomes decidedly yellow. 



E. Mitchells, Harv., Ner. Am. Bor., Vol. I, p. 142, PI. 12 g. 



1 l Tufts feathery ; filaments very slender, decompoundly much branched ; 

 the branches and their lesser divisions alternate ; the ultimate ramuli 

 approximated ; angles wide, and branches and ramuli patent ; ramuli 



