64 
FUCACEiE.— Halideys. 
iv. 
liandsome shore-plants, and readily known by their articulated, many-celled air- 
vessels. 
1. Halideys siliquosa, Lyngb., frond compressed, narrow, repeatedly pinnate ; 
air-vessels compressed, oblong or linear-lanceolate, mucronate, slightly constricted 
at the septa ; receptacles lanceolate. J. Ag. Sp. Alg ., vol. 1 , p. 23 6 ; Kiitz , Sp. Alg ., 
p. 604 ; Grev. Alg. Brit. t. 1. ; Harv. Phyc. Brit. t. 66 ; Cystoseira siliquosa , Ag, 
Syst., p. 287 ; Fucus siliquosus , L. — Turn. Hist. Fuc. t. 159. ; E. Bot. t. 474. 
Habitat. On rocks near low- water mark. Shores of Newfoundland, Herb. 
Banks (jicle Turner), (v. v.) 
Fronds from one to four feet long or more, linear, compressed, two edged, from 
one to two lines broad, distichous, repeatedly pinnate. Pinnae alternate, the lower 
ones much lengthened, and either naked below or furnished with a few small 
branchlets and air-vessels, pinnate or bi-tripinnate above, each successive division 
becoming narrower. Air-vessels linear-oblong, or lanceolate, supported on slender 
stalks, and tipped by a slender acumination of various lengths, which some- 
times ends in a receptacle. The air-vessels are internally divided by transverse 
membranes into numerous compartments or chambers, and externally marked at 
each partition by slight constrictions, most visible after the plant has been dried. 
Receptacles usually forming racemes, which terminate the branches, pedicellate, 
lanceolate, compressed. Colour , when young a greenish olive ; becoming a rich, 
glossy brown in age. Substance tough and leathery. 
This plant is very common on the Atlantic shores of Europe, and is said, by 
Turner, to extend south as far as the Canary Islands. On the same authority we 
claim it as a native of Newfoundland, but I have never seen any American spe- 
cimens. The above description is taken from British ones. 
2. Halideys osmundacea , Harv. frond simply pinnatifid below, with broadly 
linear, subacute midribbed laciniae ; decompound above, the pinnae and pinnuke 
slender, sub-filiform ; air-vessels moniliform, deeply constricted at the septa ; 
receptacles small, forked, crowning the air vessels. Harv. in Bot. Beecliey's Voy., 
p. 407. J. Ag. Sp. Alg., vol. 1, p. 237. Kiitz. Sp. Alg., p. 604. Cystoseira 
osmundacea , Ag. Syst., p. 287. Fucus osmundaceus, Menz. in Turn. Hist. Fuc. t. 105. 
(Tab. II.) 
Hab. Rocks near low-water mark. At Port Trinidad, on the N. W. coast, 
Archibald Menzies , Esq. California, Mr. I). Douglas. Monterey, Dr. Coulter , 
(v. s. in Herb. T.C.X).) 
Root discoid. Frond of unknown length, but probably many feet long when 
