Ulva.) ALG.F. INARTICULATE. 311 



4. P. linearis, Grev. (narrow purple- Later) ; frond linear or 

 linear-lanceolate acute, the margin nearly flat. Grev. Alg. Brit. 

 p. 170. t. 18. — Ulva purpurea, var. elongata, Lyngb. Hydroph. 

 Dan. p. 20. 



Rocks beneath Peakhead, near Sidmouth, within high-water mark, 

 Greville. At Dunmore, near Waterford, Miss Anne Taylor. ©. April 

 and May.— 3— 5 inches high, supported on a very short stipes. Fructifi- 

 cation, oval granules not 'arranged in a quaternate manner, but partly 

 scattered and partly in lines. 



47. Ulva. Linn, (part of). Ulva, or Green-Laver. 



Frond membranaceous, of a green colour, plane (in some cases 

 saccate, and inflated in the young state). Fructification ; minute 

 granules, mostly arranged in fours. Grev. Alg. Brit. p. 171. 

 t. 18. — Name; according to Theis, from Ul, water, in Celtic; 

 applied to some aquatic plant. 



* Marine species. 



1. U. latissima, Linn. Suec. (broad green- Laver) ; frond plane 

 widely oblong or roundish waved of a full green colour and 

 very tender substance. Grev — Linn. Fl. Suec. (not Sp. PL). 

 Ag. Sp. Alg. v. 1. p. 607. Grev. Alg. Brit. p. 171 — U. Lac- 

 tuca, E. Bot. t. 1551. — U. Lactuca, var. latissima, Light/. 

 Scot. 



Abundant, on rocks, stones, &c. in the sea. ©. Summer and Autumn. 

 — " Most authors consider this as a larger state only of the following. 

 Both are, I believe, indiscriminately eaten under the name of green- La- 

 ver, or Oyster-green, being served at table with lemon-juice, in the same 

 waves the jnople-Laver. This diet is esteemed good,as almost all esculent 

 vegetables are, for scrophulous habits. Lightfbot says that the inland- 

 ers ascribe to it an anodyne virtue, and bind it about the forehead ami 

 temples to assuage headache in fevers, and to procure Bleep. 



2. U. Lactuca, Linn. (Lettuce g rcen- Laver) ; frond at first 

 obovate Baccate inflated at length cleft down to the base, the 

 segments plane unequal laciniated semitransparent. Grev, — 



Ag. Sp. Alg. r. 1. p. 409. (,',rr. Crypt. Fl. t. 313. 



In the sea, on rocks and \ arious marine substances. © . May and June. 



3. U. Linxa, Linn, (ribband green-Laver); frond linear-lan- 

 ceolate attenuated at each extremity waved at the margin com- 

 posed of two closely applied membranes. Grev. — Ag.Sp, Alg* 



V. 1. p. 413. — Soli ilia I Jiizn. Ag. Syst. 



Rocks and stones in the sea. 0. Summer.— The frond is pecul 

 Dr. Greville says, in being composed of ;i double membrane, bo closers 

 applied, indeed, as t<> appear but one. Hence Agardfa srrangea it with 

 StSenia in hit Systems Algarum. "This plant deligfati to gro* in 

 those gravelly ipoti where the fresh water oozes up during the ebb-tide. 

 In such situations, it ia m>t uncommon to find specimens I feel in length 

 with a diameter not e» ending two incbi " ( 'arm. 



