THE MARINE ALG.E OF NEW ENGLAND. 85 



afterwards bocoinin^ fistulose ami tubular; peripheral iilanieuts short, 

 few-celled, the last cell obovate and several times larger than the other 

 cells 'j unilocular sporangia ovoid. 



On alga} and stones near low-water mark. 



Very common from Cape Cod southward; Xiles D^'urli, Gloucester, 



^Mass.j Europe. 



A characteristic species of Loni^ Island Sound, where it is i)n)bably more almiulant 

 mail in any other part of the world. It abounds in still, shallow bays. North ot 

 Cape CihI it is of small size, an<l is only occasionally mot with. It assumes a number 

 of dillen»nt forms, none of which, however, can be considered as distinct varieties. It 

 first appears in May, and reaches perfection in August and September. At first the 

 fronds are small and solid, but they <:jrow to be two feet lonj;, or even longer, and the 

 main branches become hollow and linally collapsed. Except that they are more lux- 

 uriant, our forms agree well with Norwegian specimens. 



31. VEKMICULAKIS, Ag. ; Phyc. Brit., PI. 31. 



Fronds tufted, gelatinous, one to two feet long, branches long, irregu- 

 larly pinnate, thick, vermiform, flexuous ; peripheral filaments clavate, 

 somewhat incurved, moniliform cells spheroidal ; unilocular sporangia 

 ovoid. 



On stones and algiT^ between tide-marks. 



Halifax, N. S., Harvey ; Europe. 



A rather common plant of Europe, and probably occurring within our limits,. bat as 

 yet only reported at Halifax on the American coast. The species is rather thick and 

 clumsy, an<l very gelatinous; not at all likely to be confounded with Jlf. divaricata, 

 ■which is less gelatinous, has a different mode of l>rauching, and whose peripheral fila- 

 ments are terminated by a cell much larger than the others. Dried specimens may be 

 mistaken for Castagnea virescens, a more slender plant, with longer and more slender 

 peripheral filaments, the upper cells of which are transformed into plurilocular spo- 

 rangia. We have only examined dried si)ecimens of this species. 



CASTAGXEA, (Derb. & Sol.) Thuret, emend. 



(In honor of Louis Caatagne, a French botanist.) 

 Fronds and unilocidar sporangia as in Mcsogloia ; plurilocular spo- 

 rangia formed by outgrowths from the uppermost cells of the peripheral 

 fdaments. 



C. VIRESCENS, (Carm.) Thuret. {Mesof/Joia vircscens^ Carm., in Phj'c. 

 Brit.; Xer. Am. Bor., V(d. 1, PI. 10 ^; Ann. Sci. Xat., Ser. 3, Vol. 14, 

 PI. 27.) PI. 7, Fig. 1. 



Fronds filiform, gelatinous, three inches to a foot and a half long, axis 

 clothed with numerous, irregular, flexuous branches, ultimate branches 

 short, given off at wide angles ; fronds at first solid, becoming fistu- 

 lous; peripheral filaments slender, clustered, recurved or incurved, cyl- 

 indrical or only slightly moniliform, cells ellipsoidal, .015-20°^™ in diam 

 eterj unilocular sporangia ovoidal or rhombic ov^ite ; plurilocular spo- 



