ULVACE^, 59 



Hab. California, Dr. Coulter. Shores of the Gulf of Mexico, Dr. Schott. (v. v.) 



More rigid than U. latissima, and divided into many long narrow segments, half an 

 inch to an inch wide, and 6-8 inches long or more, preserving a nearly equal breadth 

 throughout, and either simple or forking. Sometimes the laciniation is almost pinnate, 

 having an undivided leading segment with lateral and often opposite lesser segments. 

 Sometimes the division extends nearly to the base, and the form is then palmate. The 

 margin is mostly toothed, or cut, and frequently undulate. The colour is a full grass 

 green, and the substance rigid. It does not adhere to paper in drying. 



I possess authentically named specimens from Montagne and Von Suhr. 



2. Ulva (Phycoseris) Lima, Linn. ; frond linear-lanceolate, acute, crisped at the 

 margin, composed of two membranes closely applied. Linn. Sp. PI. p. 1633. Ag. Sp. 

 Alg. l,p. 413. Harv. Phyc. Brit. t. 39. Wyatt, Alg. Danm. No. 164. Phycoseris 

 Lima and P. lanceolata, Kiitz. Sp. Alg. p. 475, (and probably others.) 



Hab. Eocky shores of British America, and of the north-eastern States. Halifax, 

 W.H.H. Boston Bay, Captain Pike. New York Bay, Messrs. Calverley, Hooper, &c. 

 (v. V.) 



Boot a small disc. Frond 6-12 inches long or more, from half inch to one or two 

 inches in width, linear-lanceolate, tapering to the base, and either blunt or attenuated 

 at the apex, much waved and curled at the margin ; formed of two distinct, separable 

 membranes, closely applied and cohering together. Colour, a full, brilliant grass green, 

 becoming pale in age. Substance, rather soft and thin. It adheres to paper in drying. 



Agardh's U. Bertolonii appears to me to be a form of this species, which is also 

 nearly allied to Enteromorpha intestinalis, with which, if we omit the inflated frond, 

 there is much similarity in form and structure. It is not so common as the following 

 species, but is nevertheless widely dispersed. 



3. Ulva (Phycoseris) latissima, Linn. ; frond polymorphous, very broad, ovate or 

 oblong, simple or lobed, undulate, bright green. Lin. Fl. Suec. p. 433, Ag. Sp. Alg. 

 1,^.407. Harv. Phyc. Brit. tab. 171. Wyatt, Alg. Danm. No. 33. Phycoseris 

 gigantea and others, Kiitz. Sp. Alg. p. 476. 



Hab. Common on the American coast, (v. v.) 



Fronds from six inches to two feet in length, from three to twelve inches in breadth, 

 tufted or scattered ; very variable in shape, sinuated and wavy or flat, often plaited. 

 Substance, thin and soft, very smooth and glossy, like fine green silk. Colour, a bril- 

 liant green, when growing near high water mark ; darker, and often glaucous when 

 obtained from deep water, and sometimes turning brownish in the herbarium. 



