the" MARINE ALG.E OF NEW ENGLAND. 89 



iiitl A. buUonuH are to he exppctoil to occur with us. Tho J. comprvfumn of the List of the 

 Murine Alj^.i' of thf ruitod States, in the Proc. Am. Acad. Arts and Sciences of March, 

 l""?;'), is an error. Thi' only specimen seen was collecteil at CJloucc'ster l>y Mr>. LusU, 

 and proves to he a hhached and brownish fraguieut oi Ilalosaccion. 



A. ErnLNATUS, Grev.; Thyc. Brit., Tl. 194. (PL V, Fig. 3 ) 



Fronds -rrojxarioiis, simple, attached by a small disk I'rom two inches 

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

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

 the very ninnerons sori. 



Attached to algie between tide-marks. 



Common along the whole coast ; Europe. 



A homely species, usually found in tufts four or live inclies lonj;. and of ahout the 

 substance oi Scytimphon Jomentarius, but usually spotted with the numerous fruit-dots. 

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

 A. buUomts is nuich larger and more sack-like and often decidedly constricted. 



Family SPOROCHNE.E. 



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

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

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

 mentous paraphyses and sporangia ; unilocular sporangia spheroidal ; 

 l)lunlocular si>orangia cylindrical formed of a single row of cells. 



Fronds solid, sori irregidarly scattered StiIo2)hora. 



Fronds hollow, sori arranged in transverse lines Striaria ? 



STILOPnORA, Ag. 

 (From ari'/.j], a point, and oopeu, to bear.) 



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

 l)osed 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- 

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

 locular sporangia ovoidal ; plurilocular sporangia cylindrical, formed of 

 a single row of cells. 



A genus placed by Agardh and Harvey in the D'lclyotacea; but l>y other algologists 

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

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

 in which the sporangia are l)ome at the base of clavate few-ctdled paraphyses. The 

 dcvch)pment of the frond has not been made out, but at the tips of the branches is a 

 complicated mass of filaments ending in hairs like those oi Kctocarpus, at whose base 

 are borne a few short, Incurved, moniliform fdaments. At a short distance below the 

 apex of the frond the moniliform lilaments disappear and the surface appears to cou- 

 *'i'*t of roundish cells where not interrupted by the numerous sori. It is probable that, 



