THE MARINE ALG^ OF NEW ENGLAND. 89 



and A. bullosas are to be expected to occur with us. The A. comprcssus of the List of the 

 Marine Algae of the United States, in the Proc. Am. Acad. Arts and Sciences of March, 

 1875, is an error. The only specimen seen was collected at Gloucester by Mrs. Lusk, 

 and proves to be a bleached and brownish fragment of Halosaccion. 



A. eohinatus, Grev.; Phyc. Brit., PI. 194. (PL V, Fig. 3.) 



Fronds gregarious, simple, attached by a small disk from two inches 

 to a foot and a half long, about half an inch in diameter, tapering at 

 base, often twisted but not constricted, color a dingy brown, spotted with 

 the very numerous sori. 



Attached to algoe between tide-marks. 



Common along the whole coast ; Europe. 



A homely species, usually found iu tufts four or five inches long, and of about the 

 substance of Scytosiphonlonientarius, but usually spotted with the numerous fruit-dots. 

 The diameter, which is nearly uniform throughout, is about that of a clay pipe-stem. 

 A. bullosus is much larger and more sack-like and often decidedly constricted. 



Family SPOROCHNE^J. 



Fronds cylindrical or tubular, branching, composed within of elon- 

 gated cuboidal cells, which become smaller and roundish at the surface; 

 fructification in external scattered sori, composed of club-shaped fila- 

 mentous paraphyses and sporangia ; unilocular sporangia spheroidal ; 

 plurilocular sporangia cylindrical formed of a single row of cells. 



Fronds solid, sori irregularly scattered Stilophora. 



Fronds hollow, sori arranged in transverse lines Striaria ? 



STILOPHORA, Ag. 



(From crikri, a point, and <popeu, to bear.) 



Fronds olive-brown, filiform, branching, solid, becoming hollow, com. 

 posed internally of elongated colorless cells, which become smaller and 

 colored towards the surface; fruit external, scattered in spots (sori) 

 over the surface; sori hemispherical, consisting of club-shaped fila- 

 mentous paraphyses, at whose base are borne the sporangia; uni- 

 locular sporangia ovoidal ; plurilocular sporangia cylindrical, formed of 

 a siDgle row of cells. 



A genus placed by Agardh and Harvey in the Diclyotacece, but by other algologists 

 considered more nearly related to the Sporochnece. It includes only a small number of 

 species, probably not more than eight, and is readily recognized by the external fruit 

 in which the sporangia are borne at the base of clavate few-celled paraphyses. The 

 development of the frond has not been made out, but at the tips of the branches is a 

 complicated mass of hlaments ending in hairs like those of Ectocarpus, at whose base 

 are borne a few short, incurved, moniliform filaments. At a short distance below the 

 apex of the frond the moniliform filaments disappear and the surface appears to con- 

 sist of roundish cells where not interrupted by the numerous sori. It is probable that, 



