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34-2 43.Dictyopt. 2.THALSSI0PHYT^. Plcell.aph.
Dictyopteris elongata. Long diclyoptere.
ThaUiis 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 ;
Dictyopteris elongata, Lamouroux Essai.
Engl. Bot. 1758.
Sea-shore.
Holdfasts callous ; thallus woolly, very thin, when dry
transparent, greenish.
E. Ulvoide^. Thallus continuous, membranaceous,
leatherhke 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. 'M. ASPEROCOCCUS. Lamour. Roughfruit.
Thallus leatherlike, compressed, tubular ? branched,
"brownish ; sporidia ped uncled, in scattered groups on the
surface of the thallus; holdfasts shieldlike.
• Asperococcus multifida. Mamj-cut roughfruit.
Thallus cartilaginous, brownish, repeatedly branched,
rather palmate; lobes spreading, linear, various in length
and breadth.
Ulva mullifida, 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 ; stirpsuone; holdfasts shieldlike; sporidia
4 together, immersed in the substance of the thallus.
1. Ulva lacluccpfoUa. LeLluce-leaf laver.
Thallus bright green, aggregate, oblong, undulated, bul-
lated, below attenuated, above dilated, lobed, crisped.
Ulva marina laciucJE similis. Rail Syn. 62, 1.
Treraella marina vulgaris lactucEe 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.