THE MARINE ALG.E OF NEW ENGLAND. 173 



simple branchlots, ultiiuiite divisions capillary, tufted ; aiitheridia ob- 

 loDg:, terminal ; cystocaii)s ovate. 



On stones and Zostcrn at low-water mark. 



Lynn, Mass., llarvcij ; AVood's IIoll, Noank, Client Point, Newport, 

 and several plaees in Long Lsland Sound ; I-^nrope. 



Rntlior a common species in sheltered places south of Cape Co<l, but ouly known 

 northwanl from the reference of Harvey. It is snialh'r and more slender than the last 

 species and tlu' branches are not naked, but fibrillost\ The i>resent species is more 

 nearly related to /*. violaaa, of which Ilarvcy su«xgests that it may be a variety. 

 The last-named species is more decidedly red in color, is a lar«;er plant, and althouj^h 

 the ultimate branches are in tufts, as in P. fibrillosa, the lar«^er branches are destitute 

 of the tibrillose branclilets characteristic of the latter species. 



P. VIOLACEA, Grev.; rbyc. Brit, Tl. L>09. 



Fronds brownish red, six inches to two feet long, elongated, pyramidal, 

 usually with an undivided main axis, which has several long, widely 

 spreading branches near the base, main divisions robust, becoming 

 capillary at the tops, branches rather naked below, bearing above numer- 

 ous multilid branchlets, ultimate branchlets densely tufted; antheridia? 

 cystocarps broadly ovate, sessile or shortly pedicelled. 



Var. FLEXiCAULis, Harv. 



Branches very long, slender, angularly bent, much divided, divisions 

 patent and sometimes secund. 



In deep tide-pools on exposed shores and on Zostcra in deep water. 



Common from New York northward. Yar. flexicanJiSj Cape Ann; 

 Portland, C. B. Fuller ; and northward. 



One of (he commonest species of the genus, frequenting cold, exposed tide-pools, where 

 it has a dense habit and rarely exceeds a foot in length. When growing in deep water 

 it is long and slender. In spring it has a pink color, but late in the season it becomes 

 dark colored, almost blackish. Specimens of the i>resent species are sometimes found 

 in American herbaria bearing the name of P. lirodicei, a species having six siphons, 

 ■which has not as yet been detected with certainty on our coast.. The P. Brodiai of 

 Bailey's List of United States Algui is, according to Harvey, P. fibrillosa. 



Sect. IIL Sijihons more thanfour^ corticating cells icanting. 



P. VARIEGATA, Ag. ; Phyc. Brit., PI. 155; Ann. Sci. Nat., Ser. 3, Yol. 

 XVI, PI. G. 



Fronds purplish brown, densely tufted, four to ten inches high, fda- 

 luents setaceous and rigid below, capillary above, dichotomo-multifid, 

 the lower axils patent, branches above somewhat zigzag, elongated, 

 with alternately decompound, flaccid branchlets, siphons six in number, 

 cortications wanting, internodes not much longer than broad ; antheridia 

 linear-oblong, mucronate; cystocarps ovate, short-stalked. 



At the foot (»f wharves, on Zosfrra, &c. 



