166 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



abaudoued altogetlier. The liabit of the species of the present geuus is much like that 

 of Laurencia, hut the polysiphonous character of the fronds is more evident, the sub- 

 stance more delicate, and the hranchlets more distinctly club-shaped than in that 

 genus. As in Laurencia, the apices are all depressed, the growing point being sunk in 

 a hollow concavity, from Avhich, as well as from the younger part of the fronds, project 

 numerous tufts of hyaline, dichotomous, monosiphonous filaments. 



C. DASYPHILA, Ag. {Laurencia dasijpMlaj Pliyc. Brit., PI. 152.) 



Fronds dioecious, four to eight incites liigli, broadly pyramidal in 

 outline, cylindrical, robust, densely branched, generally with a percur- 

 rent axis and alternate, spreading, pinnately decompound branches, ulti- 

 mate divisions short, club-shaped or top-shaped, very obtuse at Rpex 

 and much constricted at base j cystocarps sessile on very short branch- 

 lets. 



Yar. SEDIFOLIA, Ag, (Chondria sedifoUa^ Xer. Am. Bor., Part 11^ 

 PL 18^.) 



Branches fasciculate, approximate, branchlets obovate-oblong. 



On rochs and stones at low- water mark, and on Zostera. 



Common from Kew York to Cai)e Codj Europe. 



A rather coarse species which does not collapse when removed from the water, but 

 which glistens on account of the water held by the tufts of hyaline filaments at the 

 tips of the branches. The species is recognized by its coarseness and broadly pyra- 

 midal outline and by its club-shaped ultimate divisions. The variety has rather less 

 obtuse tips and is not uncommon. In spite of its coarseness, the species quickly decays 

 in fresh water. 



0. TENUISSIMA, Ag. {Laurencia tenuissima, Phyc. Brit., PI. 198. — 

 Chondria tenuissima, Xer. Am. Bor., Part II, PI. 18/; Etudes Phycol., 

 Pis. 43-48.) 



Fronds dioecious, foifr to eight inches high, narrowly i^yramidal in 

 outline, cylindrical, slender, rather loosely branched, with a percurrent 

 axis and long, suberect, alternate, virgate, pinnately decompound 

 branches, ultimate branchlets narrowly fusiform, attenuated at both 

 extremities. 



Yar. Baileyana. {Laurencia Bailei/ana, Mont., Ann. Sci.Xat, Ser. 3, 

 Yol. II, p. G3.—CJiondria Bailey ana, Harv., Xer. Am. Bor., Yol. II, 

 PI. 18 a.— Chondria striolata, Farlow, List of Marine Alg?e.) 



Branches erect, subsimple, beset with slender curved branchlets, which 

 are much attenuated at base and blunt at the apex. 



On stones at low- water mark. 



Squam, Mass., and common in Long Island Sound j Europe. 



A variable epccies, distinguished from the last by its hghter yellowish color, less 

 dense branching, and slender fusiform branchlets. The typical form is common with 

 US, but not so common as variety Baihyana, which was considered by Agardh to be 

 .the same as C. striolata Ag. The species seems to us rather to be a form of C. tonuis- 



