THE MARINE ALG.E OF NEW ENGLAND. G9 



■would, however, inclino one to consiilrr that tho authoiidia in this genus were not 

 proper male bodies. 



Some of the »\^ec\es oC ICvtocarpus described by Ilurvey in tho Nereis were founded on 

 sterile specimens, but, at the present day, algologists agree in thinking that tho pres- 

 ence of sporangia is necessary for tho determination of species of Ectocarpus, aiul we 

 have, accordingly, omitted the Ilarveyan species founded on sterile plants as being 

 inadeciuato. 



SrnoENrs STREBLONEMA, Dorb. & Sol. {ilntomma, R.insth). 



Primary brauclies procumbent, creeping in or over the substance of 

 other al«^a>; secondary anil fructifying: ramuli erect. 



E. CiiORDARi^i:, n. sp. 



Fihiments much branched, irre.nularly ]iodose, about .02'""' in diam 

 e!:er, sank in th3 tissue of the host-pla^it; hairs and fertile branches erect, 

 the former projeotin*^ above the surface; unilocuhir sporangia on short 

 stalks, solitary or clustered, oval, about .07"™ broad by .14'"™ long; 

 l)lurilocular sporangia unknown. 



Parasitic in the fronds of Chordaria divaricata, Leathesia tuheriformis^ 

 and other Phcvosporccv. 



Wood's noil, Gloucester, Mass. ; Newport, E. I. 



A coamou but iasignilicant species which grows in the cortical portion of different 

 J'li(rosporea\ especially Chordaria divaricata, and usually in company with Bulbocoleon. 

 It forms dark-colored spots on tho surface of tho plant in which it is growing, and, on a 

 hasty microscopic examination, would pass unnoticed, so great is tho resomblanco of the 

 sporangia to those of Chordaria. Our i)lant resembles S. sjyharicum, Thuret, but differs 

 from tho Mediterranean forms of that species in having oval, not spherical, sporangia, 

 which are often clustered. Tho filaments, too, aro composed of very irregular-shaped 

 cells, and aro never mouiliform as in well-developed specimens of S. sjjhcuricum. It 

 may, however, be tho case that what we have considered specific marks are only local 

 variations. It may also bo asked whether tho present species is not tho form of S. 

 f'lsciculatum, Thuret, which bears unilocular sporangia. At present only tho plurilocu- 

 l\r form of sporangium is knowu in that si)ccies as it occurs in Europe. 



E. REPTANS, Crouan, Florule du Finistere, p. IGl; Kjellmau, Bidrag 

 till Kann. Skaud. Ect. Tilop., p. 52, PI. 2, Fig. 8. 



Filaments forming circular spots on the host-plant, primary branches 

 ver}- densely branching, so that they almost form a membrane, fur- 

 nisheil with numerous erect branches, which are .S-?"""" high and grad- 

 ually taper to a hyaline hair; cells at base about .Ol""™ broad ; plurilocidar 

 sporangia arising from the i)rimary fdaments, sessile or on short stalks, 

 ovate-acuto, .012-20-^™ broad by .OaS-TG""" long. 



On PhylUtis and DictijOHiphon, Summer. 



I^ewport, 11. 1. ; Europe. 



A larger species than tho preceding and growing more superficially, so that the fila- 

 ments may bo said to creep over the surface rather than in tho substance of the host- 

 plant. Owing to the dense branching of tho prostrate filaments and the abundance 



