THE MARINE ALG.E OF NEW ENGLAND. 35 



Gloucestor, !Mass., Mrs. A. L. Davis^ and southward; luiropc. Sum- 

 mer. 



A common species of the New England eoiwt, abundant in sliall«>\v, brack i.sh ikkiIh, 

 where it covers the exposed alg:p and Zostera. Much h^ss striking than L. inajuscula, 

 llarv., from which it is distinguished at sight by its brighter green coU)r, changing to 

 yellowish rather than blackish, by the diameter of its lilaments, which is about half 

 that of L. tnajiitnula, by its thinner sheath, and by forming thin strata rather than 

 loose tufts. In tlu'Ner. Am. Bor., Part III, the diameter of the filaments of A. majm- 

 cula, Harv., is given as .05 inch, and that of the lilaments of L. fcrrugima, Ag., .as .001 

 inch, which is evidently incorrect, as one species is not fifty or eveu five times larger 

 than the other. 



L. LUTEO-FrsCA, Ag'. (L. fulvaj llarv., Ner. Am. Bo:\, Part III, 

 p. 102, ri.47/.) 



Filaments fasciculate, ei^ect, greenish yellow, .008-10""" in diameter, 

 sheath distinct. 



Exs. — Alg:. Am. Uor., Farlow, Anderson «^ Katon, Xo. 48. 



Stonington, Conn., Bailey; Xoank, Conn.; Wood's Holl, Mass., W. G. 

 F.; Europe. 



Apparently a common alga of Southern New England, dithering in its habit from all 

 our other 8i>ecies of the genus, except L. tenerrima. It grows in large jiatches on 

 stones and wood- work between tide-marks. The filaments are erect, from one to three 

 inches high or somewhat higher, when in their best condition olive-colored, but 

 more frequently a pale yellow. The thickness of the sheath, by which Harvey sepa- 

 rated his L. fulva from L. luieo-fusca, Ag., is by no means constant, and the species 

 cannot be kept distinct. As is the case in several of the species of Lynghya, the sheath 

 is sometimes two, three, or even a greater number of times thicker than at others. 



L. TENERROIA, Thuret, mscr. 



Filaments slender, fasciculate, erect, bluish green, .0035""" in diam- 

 eter, sheaths very thin. 



Gloucester, Mass., Mrs, A. L. Davis; Newport, R. I.; Europe. 



This species was first detected near Gloucester, by Mrs. Davis, growing apparently 

 on sand-covered rocks. The filaments are bluish green, and not over a quarter of an 

 inch high. The species will be easily recognized by the diameter of the filaments, 

 which is decidedly less than that of any other of our species. Dr. Bomet, to whom 

 a specimen was sent, considers our plant the same as that collected by the late M. 

 Thuret, at Biarritz, France, and named by him L. tenerrima. I have since found it ia 

 considerable quantity at the base of the clifis near the Winans mansion, at Newjwrt. 



L. NiGRESCENS, Harv., Xer. Am. Bor., Part III, p. 102, PL 47 d. 



** Filaments very slender, flaccid, densely interwoven into a fleecy, 

 blackish-green stratum." (Ilarvey, 1. c.) 



Canarsic Bay, L. I., Hooper; Peconic Bay, Harvey ; on mud and on 

 Zostera, Gloucester, Mass., Mrs. A. L. Davis. 



Var. 3IA.J(>R. 



Filaments forming a dark brown gelatinous stratum, .0152"" in diam- 



• r, sheath thin. 



