$42 43. Dictyopt. 2. THALSSIOPHYTA. Pi, cell. aph. 
Dictyopteris elongata. Long dictyoptere. 
Thatlus linear, membranaceous, pellucid, greenish brown; 
midrib slightly prominent, here and there proliferous ; edge 
not in the least cut; branches long. 
Fucus membranaceus, Stackh. Nereis, 13; Engl. Bot. 1758. 
Dictyopteris elongata, Lamouroux Essai. 
Sea-shore. 
Holdfasis callous; thallus woolly, very thin, when dry 
transparent, greenish. 
. 
E. Utvoiwez. Thallus continuous, membranaceous, 
leatherlike or gelatinous, regularly cellular; integuments 
smooth, membranaceous; sporidia scattered in the substance 
of the thallus, or in prominent spots.—Greenish, either 
permanent, or becoming whitish. 
XIX. 44. ASPEROCOCCUS. Lamour. = Roughfruit. 
Thallus leatherlike, compressed, tubular ? branched, 
brownish; sportdia peduncled, in scattered groups on the 
surface of the thallus; holdfasts shieldlike. 
Asperococcus multifida. Many-cut roughfruit. 
Thallus cartilaginous, brownish, repeatedly branched, 
rather palmate; doles spreading, linear, various in length 
and breadth. 
Ulva multifida, Engl. Bot, 1913. 
Sea-shore. 
Holdfasts shieldlike; thallus 4 or 5 inches long. 
XX. 45. ULVA. Linnzus. Laver. 
Thallus membranaceous, flat, nerveless, mostly green, 
rarely purplish; sé7rps none; holdfasts shieldlike; sporidia 
4 together, immersed in the substance of the thallus. 
1. Ulva lactucefolia. Lettuce-leaf laver. 
Thallus bright green, aggregate, oblong, undulated, bul- 
lated, below attenuated, above dilated, lobed, crisped. 
Ulva marina lactuce similis, Raii Syn. 62,1. 
Tremella marina vulgaris lactuce similis, Dillen. Musc. 42. 
Ulva Lactuca, Lin. 8. P. 1682; Engl. Bot. 1551. 
Green laver, Oyster green. 
Stones and shells in the sea; annual. 
Thallus pale green, very tender, thin, flaccid.—Salt and 
bitterish, eaten stewed with lemon-juice as an antiscorbutic, 
but acts strongly upon the bowels. _ 
