PL cell. aph. 2. THALASSIOPHYTiE. 45. Ulva. 34$ 
2. Ulva lalissirna. Broadest layer. 
Thallus yellow-green, solitary, oblong, very broad, flat* 
edge waved. 
Ulva latissima, Lin. S. P . 1632. 
Sea- shores. 
Thallus 2 or 3 feet long, nearly a foot broad, edge waved,, 
base not narrower. 
3. Ulva bullosa. Bullate layer . 
Thallus dark green, dilated, at first tubular, then flat- 
tened, sinuous, rather plaited, slippery. 
Ulva palustris lactuca? marina? similis, sed multo minor et tenerior*. 
Dill n in Itaii Syn. 63, 6. 
Tremella palustris, vulgari similis, sed minor et tenerior, Dillen Muse. 
Ulln bullosa, Roth Cat. 3, 329. 
Ulva Lactuca jS, Hudson FI. Angl . 567. 
On aquatic plants in ditches; annual; Sept, to May. 
Thallus solitary or aggregate. 
4. Ulva lanceolata. Lance l aver. 
Thallus pale green, ovate, spearshape. 
Ulva lanceolata, Lin. S. P. 
Rocks on the sea-shore. 
Thallus 9 inches to a foot long. 
5. Ulva fasciala. Banded laver „ 
Thallus green, aggregate, lanceolate, not cut, narrower 
at both ends, flat ; edge fiexuous. 
Ulva Linza, Lin. S. P. 1633. 
Tremella marina fasciata, JJillcn in Raii Syn. 62, 3 ; Muse. 46. 
Thallus 6 to 12 inches long, an inch broad. 
6. Ulva plicata. Folded laver ... 
Thallus dark green, connate at bottom, imbricate, plaited*. 
ovate, blunt. 
Lichen marinus, Taberncnn. Icon. 814. 
Bryon lactucaefolium, Label. 2, 247. 
Ulva plicata, Flor. Dan. 829. 
Rocks and the sea-shore. 
Thalli many, aggregate, umbilicated at bottom, in the 
centre. 
7. Ulva terrestris. Land laver,, 
Thallus dark green, aggregate, ovate, crowded, slender* 
decumbent, plaited, crisped. 
