The English flora - SeaweedAfrica

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296 ALGiE INARTICULATE. [Laurencta.
compressed snbcartilaginous bi-tripinnatifid the branches alter-
nate, ultimate ones obtuse simple or lobed. Grev. Alg. Brit,
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p. 108. t. 14.— Chondria pinnatifida, Alg. Sp.Alg.p. I. p. 337.
Gelidium pinnatif., Lyngb.— Fucus pinnatif., Huds.— Turn. Syn.
Fuc. p. 267, Hist. Fuc. t. 20. E. Bot. t. 1202.—£. Osmunda ;
frond flat generally undivided, ramuli short andmultifid.
I. d—Fucus Osmunda, Gmel. Stachh.— y. angusta ;
Turn.
frond
roundish, ramuli cylindrical thickened upwards set on all sides
of the stem often clustered and simple. Turn. I. c 8. tenuissima
; frond flat, ramuli very thin and much branched, the
branches divaricated. Turn. 1. c.
a. j8. y. Rocks in the sea, everywhere. l. Devon and Cornwall, Mr.
Stackhouse, Mrs. Griffiths. © . Summer.—Besides the common modes
of fructification on this very variable plant, Mrs. Griffiths finds capsular
receptacles, and Miss Cutler, saucer-shaped receptacles, filled with
" numerous linear, simple, or divided bodies, vertically arranged, appar-
ently composed of very short filaments surrounding a longitudinal axis,
the whole terminated by a number of round pellucid lobes." The species
is from one to many inches in length.
2. L. obtusa, Lamour. {blunt-pointed, Laurcncia) ; frond cylindrical
filiform repeatedly pinnated, branches generally opposite,
ramuli cylindrical short patent truncated. Lamour. Essai
p. 42 {and L. intricaia, L. cyanospermia, together with L. gelatinosa
and lutea of the same author, according to Ag.). Grev. Alg.
Brit. p. 111.— Chondria obtusa, Ag. Sp. Alg. v. 1. p. 340.
Fucus obtusus, Huds.— Turn. Syn. Fuc. p. 43. Hist. Fuc. t. 21.
E.Bot.t. 1201.
Parasitic on the larger Alga on most of our coasts, but chiefly in the
south. 0. Summer.—3 — 6 inches long. Colour a pale very fugitive
pink.
** Hamuli much attenuated at the base.
3. L. dasyphylla, Grev. {thick-leaved Laurencia) ; frond filiform
cylindrical branched in an irregularly pinnated manner,
branches patent mostly simple, ramuli cylindrical scattered proliferous,
attenuated at the
L. caispitosa et GigarUna
base. Grev.
dasyphylla,
Alg. Brit. p. 112
Lamour. — Chondria
dasyph., Ag. Sp. Alg. v. 1. p. 350. Fucus dasyph., Woodw. in
Linn. Trans, v. 2. p. 239. t. 21. Turn. Syn. Fuc. p. 38, Hist.
Fuc. t. 22. E. Bot. t. 847.
Rocks and stones, on the sea-shore in various parts of Great Britain.
0. Summer.—Frond 3—6 inches in length, pale pinky-brown, generally
marked with transverse striae.
4. L. tenuissima, Grev. {slender Laurencia) ; frond filiform
much branched in a pinnated manner, ultimate branchlets short
setaceous much attenuated at the base.— Grev. Alg. Brit. p. 113.
— Gigartina tenuiss., Lamour.— Chondria tenuiss.,Ag. Sp.Alg. v.
1. p. 353. Fucus tenuiss., Good, et Woodiv., in Linn. Trans.
v. 3. p. 215. t. 19. Turn. Syn. Fuc. p. 35, Hist. Fuc. t. 100.
E. Bot. t. 1882.
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