rUESU-WATER ALGJi OF THE UJSIITED STATES. 207 



Genus DEAPARNALDIA, Ag. 



Fila articulata ramosa, e cullulis magnis, maxime liyalinis, fascia chlorophyllosa latiuscula oniatis 

 'semper sterilil)us foruiata, fasciculis peuicillato-raimilosissiinis, e oillulis iiiiiioi-ibus foi'tililjus coin- 

 positis, plus minus dense obsessa. Articuli termiuales omuiuiu ramulurum iuanes achroi steriles, iu 

 pilum Lyalinum plus minus elougati. 



; Filaments articulated, branched, formed of large cells which are chiefly hyaline, but furnished with 

 a transverse chlorophyllous fascia, more or less densely clothed with penicillately raniul<ise fasciculi, 

 formed of smaller fertile cells. Terminal articles of all the joints empty, IruuBpurcut, sterile, and 

 elongate, iu a more or less hyaline hair. 



D. ^lomerata, (Vauch.) Ao. 



D. filis ramisque primariis aclirois vel subachrois, ad 0.001 4'l" crassis, articulis inferioribus 

 diamctro ajqualibus vel paulo brevioribus, geniculis manifesto eoustrictis, fasciis chloropiiyl- 

 losis angustis dilute viridibus; ramis iirimariis subrectangulo-patentibus, s»pe oppositis ; 

 ramulorum fasciculis confertis, patcntibus, alteruantibus vel oppositis, dense ranicllosis, sub- 

 ovalibus, obtusis. (R.) 



Sijn. — D glomcrala, (Yaucuer) Agarpii. Rabenhorst, Flora Europ. Algarum, Sect. III. 

 p. 38. 



//a6.— Rhode Island ; (S. T. OIney) Thwaites. 



Filament and primary branches colorless or subcolorless, and reaching 0.0014T" in diameter, 

 lower articles about as long or a little shorter than broad, manifestly constricted at the 

 joints, chlorophyl fascia narrow, light green ; primary branches subrectangnlarly patent, 

 often opposite ; fasciculi of branches crowded, patent, alternating, or opposite, densely 

 ramellose, suboval, obtuse. 



Hemarks. — According to M. Thwaites the true Dr. ghmerata grows in Rhode 

 Island, as he so identified specimens sent to liim by Mr. Oluey. These specimens 

 iwere, however, in all probability dried, and if this was so, I confess not to attach- 

 ing much weight to the identification. The i)/a^>ar«oWm, common near Philadelphia, 

 is at once so like and yet so different from the description of D. (jlomerata, that I 

 fam unable to fully satisfy myself whether it be a variety of the European species 

 [or distinct from it. It differs very greatly iu the thickness of the stem and pri- 

 'mary branches. I have given above P>'of Rabcuhorst's description of the Euro- 

 pean variety, and now append one of th "; plant growing in this neighborhood. 



Tar. maxima. 

 Dr. fills achrois, ad 004" crassis, articulis plerumqne dianietro duplo longioribus, in medio 

 saepe valde tumidis ; ramis primariis achrois vel subachrois, oppositis vel alteruantibus vel 

 ternatis, elongatis, dense ramell(jsis, cum ramulis lanceolatis ; ramulorum extremorum 

 fasciculis dense ramelosis, ovjitis vel late lanceolatis, plerumque confertis ; ramulorum 

 articulis inferiorilius plerumque dianietro (ad tsVs") subaequalibus, articulis superioriljiis 

 diametro duplo aut triplo longioribus, plerumque piliferia. 



Hah. — Prope Philadelphia ; Wood. 



Filament transparent, attaining a diameter of 0.004", its nrtieles mostly twice as Inns- as 

 broad, strongly swollen in the middle ; ])riinary branches colorless or subcolorless, o|q>osite, 

 alternate or ternate, elongate, densely ramellose with the rarauli lanceolate ; fasciculi of 

 extreme branches densely ramellose, ovate, or broadly lanceolate, mostly crowded, inferior 

 articles of the branches mostly about as long as broad (uVfi"); s°P<^'"'°'' 8''*'<-"les two to three 

 times as long, mostly pilifcrous. 



