THi: MAKINE ALG.E OF NEW ENGLAND. 43 



3. Var. Lactuca. Le Jolis. {U. latufnima, llnvy., imviim.— Phycoserh 

 ligantea^ Kiitz.) 



Froud orbicular, obloug or elongate-fusciato, simple, uiulivided or 

 scarcely lobed, Ireqiientb* spirally contorted. 



y. Var. LATissiMA, Le Jolis. 



Frond simple, at first cuneate-substipitate, afterwards broadly ex- 

 panded. 



Very common all over the world, especially in brackish waters. 



The present ypt'cies nearly corresponds to the I'ha latiitsima of the Nereis Am. Bor., 



-lit is not the V. Lactuca of that work. It is distini^uished from the remaining species 

 t»y being always flat, never tubular at any age, and by its more or less orbicular out- 

 line not becoming linear or ribbon-shaped. Var. a is the common Ulva on rocks and 



;i i>ools exposed to the action of the waves. The frond, although not very large, is 

 : igid, and does not adhere well to paper in drying. In outline it is orbicular, and is 

 _onerally divply incised. Var. 3 has a more elongated shape, and is generally plicato- 



;udulate. Var. v is very common in brackish places on the mud, and attains a very 

 : irge size. When fully grown it has no definite shape, but is ragged on the margin 



.ml often perforated. 



Ulva enteromorpha, Le Jolis. 



Frond linear or lanceolate in outline, attenuated at base, the two lay- 

 ers of cells either entirel}' separating, so as to form a tubular frond, or 

 slightly cohering, forming a flat fi'ond. 



a. Var. LANCEciLATA, Le Jolis. ( Ulva Linza^ Greville & Harvey. — 

 Phycoseris lanceoJata and crispata, Kiitzing.) 



Frond narrow, flat, ribbon-shaped, unbranched, much attenuated at 

 ^»ase, margin somewhat crisped, sometimes so much so that the frond 

 .ippears spirally twisted. 



3. Var. INTESTIN.AXIS, Le Jolis. (Enteromorpha intcstinaliSj Auct.) 



Frond simple, attenuated, and subcompressed at base, above tubuloso- 

 iuflated. 



;'. Var. compressa, Le Jolis. {Ulva compressa, L. — Enteromorpha 

 compressa, Auct.) 



Frond tubuloso-compressed, generally proliferously branchexl, branches 

 uniform, simple, attenuate at the base, broader and obtuse at the ai>ex, 

 color somewhat dingy. 



Very common all o\ er the world, particularly in brackish water. 



This species includes the llva Lima, Enteromorpha intestinalia, ani\ Enteromorpha com- 

 'cssa of the Nereis Am. Bor., which can only be reganled as varieties of one species. 

 1 he species reaches itw highest development in the var. 3 (Enteromorpha intcstinalii*, 

 Auct.), which is excessively common in all shallow water along our coa.st, and is con- 

 l»icuously disagreeable by its resemblance in shape to the swollen intestines of somo 

 luimal. The species approaches lira Lactuca, L., in var. a, which is not so common 

 as the other forms of the species whose long ribbon-like fronds are compressed instead 

 of tubular, as in var. ^. In var. y, with branching instead of simple fronds, tho 



