THALLOGENS. 7 ALGALS. 
Fucus. Linneus. 
Frond leathery, dichotomous, flat, linear ; usually furnished with large air- 
cells. Spores arranged in tubercles buried in mucus and collected in 
heads, through pores in which they are discharged. 
1. F. vesiculosus Linn.—(Sea Ware. Seawrack. Ketp Ware. Brack 
Tane. Swine Taye.) Fig. 6. 
Frond quite entire, with a midrib; air-cells 
round, usually in pairs; heads of spores 
terminal, oblong, blunt, yellowish. 
Habitat. Sea-shores. Perennial. 
Quality. Detergent, discutient, sub-nutritious. 
Uses. Glandular affections and scrofulous tumours. A 
dentifrice. Makes good manure. Furnishes Kelp. 
Ina. Bory. 
Frond flat, cellular, expanded, between fleshy 
and cartilaginous, purplish-red. Tetra- 
' spores collected in gelatinous spheres buried 
in the substance of the frond. 
1. I. edulis Bory.—(Dutsz in the S.W. of Eng- 
land.) Fig. 5. 
Frond undivided, obovate or wedge-shaped, very 
succulent, dull purple, tapering into a short 
stalk. 
Habitat. Rocks in the sea. Biennial. 
Quality. Nutritious. 
Uses, Employed as food by fishermen, either raw, or pinched between hot irons.— 
Stackhouse. 
Lavrencta. Lamourousx. 
Frond cylindrical or compressed, between cartilaginous and gelatinous, 
yellowish or purplish red. Tetraspores contained in ovate cystocarps, 
and lying imbedded in the branches. | 
1. L. pinnatifida Lamouroux.—(Peprer Doutse.) Fig. 3. 
Frond dull purple or greyish, compressed, cartilaginous, twice or thrice 
pinnatifid, the divisions blunt, entire or lobed. Cystocarps near the 
end of the branches, the size of poppy seed. 
Habitat. Rocks in the sea. Annual. 
Quality. Pungent, nutritious. 
Uses. A condiment, when other sea-weeds are eaten. 
Ruopomenia. Greville. 
Frond flat, membranous, pink or red, veinless, sessile, with a very short 
stem. Tetraspores in the substance of the frond or collected in super- 
a ficial spheres or coccidia. ee 
1. R. palmata Greville—(Durse. Duutsk. Deuusn. Dutuse, or 
__ Water-leaf, among the Highlanders.—Grev.) es 
Frond purple, leathery, or somewhat membranous, broadly wedge-shaped, 
Fig. 6.—Portion of the frond of Fucus vesiculosus in fruetification ; ¥, one of the vesicles by which ie 
