342 43. Dictyopt. S.THALSSIGPHYTAL PI cell. aph. 
Dictyopteris elongata. Long dictyoptere. 
Thallus 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, Lamoaroux Essai. 
Sea-shore. 
Holdfasts callous ; thallus woolly, very thin, when dry 
transparent, greenish. 
E. Ulvoide^:. 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 ; sporidia peduncled, in scattered groups on the 
surface of the thallus; holdfasts shieldlike. 
Asperococcus multifida . Many-cut roughfruit . 
Thallus cartilaginous, brownish, repeatedly branched, 
rather palmate; lobes 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. Linnaeus. Laver . 
Thallus membranaceous, flat, nerveless, mostly green, 
rarely purplish; stirps none ; holdfasts shieldlike; sporidia 
4 together, immersed in the substance of the thallus. 
1. Ulva laclucccfolia. Lettuce-leaf laver. 
Thallus bright green, aggregate, oblong, undulated, bul- 
lated, below attenuated, above dilated, lobed, crisped. 
Ulva marina lactucae similis, Ran Syn. 62, 1. 
Tremella marina vulgaris lactucae similis, Dillen. Muse. 42. 
Ulva Lactuca, Lin . S. 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. 
