FRESn-WATEIl ALG^ OF THE UNITED STATES. I39 



linear. Empty frond minutely punctate ; f. v. narrow elliptic, with several inflated protube- 

 rances, ends scarcely dilated, rounded; tr. v. with four inflations at sides and one at each 

 end. (A.) 



circiilare, IIassal. 



E. mediocre, diametro duplo longius; seniicellulis trilobis (at non semper distincte), ad basin 

 versus tumoribus qiiini.s aut pluribus iu series dua.s v. tres alternantes aut singulo central!, 

 quaternis semicircularitcr ordinatis instructis, lobis basalibus siuuato-eniarginatii^, subitu in 

 lobum polarem apice paullum dilatatum attenuatis; cytiodermate subtilitcr punctato. (R.) 



Syn. — E. circulare, Uassal, Fresh-Water Algaj, p. 383. 



llab. — Providence, Rhode Island ; Bailey. 



"Frond about twice as long as broad, tapering upwards into a nock, end not dilated, its notch 

 an acute incision. Empty frond, segments with live Iiasal inflations, four iu a half circle 

 around the fifth and two others at the e.\tremity." Archer. 



(Tar. Kalfsii) 



Semicellula tumoribus minimis 11 in series tres alternantes ordinalis. 



Eab. — Saco Lake, New Hampshire ; (F. W. Lewis) Wood. 



E. Jenneri, nobis. Frond scarcely twice as long as broad; segments 3-lobcd, basal portions 

 subqnadrate, eniarginate at the sides ; end lobe, its notch linear. Empty frond punctate, 

 segments with several inflations arranged in alternate lines. (Arelior.) 



E. iiisig^ne, Hassall. 



E. subgracile, diametro duplo-triplove longius, a vertice fere quadratum, lateribus eoncavis, 

 angulis rotundatis; seniicellulis basi iiiflatis, integris,e basi subreniformi in colluin elongatuni 

 citius attenuatis, lobo polari dilatato bifido truncato ; cytiodermate subtiliter punctato. (Pi.) 



Long. 0.0039"— 0.0043". Lat. mas. 0.00230". (R.) 



Syn. — E. insigne, Hassall, Fresh- Water AlgEe, p. 21. 



Hub. — Florida; Rhode Island; Bailey. 



Frond rather more than twice as long as broad ; segments inflated at base, sides entire, without 

 lateral tubercles, and tapering into a long slender neck ; end lobe dilated, its notch linear. 

 Empty frond minutely punctate ; f. v. segments with two inflations at the base ; f v. narrower, 

 gradually tapering to the end, which is considerably dilated; projections rounded, with a 

 sinus between ; tr. v, subquadrate, slightly concave at sides, with a rounded lobe at the 

 centre of each end ; e. v. end lobe with a sinus at opposite external margins, angles thus 

 protruded into four divergent rounded lobeluts. (A ) 



E. Rair!«ii, Rabenh. 



E. mediocre, leviter compressum, medio inflatum, diametro duplo circiter longius ; seniicellulis 

 pyramidalibus, e basi ventricosa in lobum i)olarem rectum truncatnm siiiuato-atteiiuatis ; 

 cytiodermate subtiliter punctato, punctis in liueas rectas ordinatis. (R.) 



Syn. — E. ansatiim, Eur. et auctores. Rabenhorst, Flora Europ. Algarum, Sect. III. p. 1S4. 

 E. Ralfsii, Rabenhorst, Flora Europ. Algarum, Sect. III. p. 184. 



Hab. — South Carolina ; Rhode Island ; Bailey. White Mountains, New Hampshire (F. W. 



Lewis). 



"E. ansatum, Ehrb. Frond aljout twice as long as broad; segments inflated at the base, taper- 

 ing upwards without sinuations into a neck, end not dilated, rounded, its notch linear. Empty 



