The English flora - SeaweedAfrica

Desmares'ia.] ALGJE INARTICULATE. 273
Shores of the island of Islay, one of the southern Hebrides, James
Chalmers. 0.— In length from 2 to 8 or 10 inches, obtuse, sometimes
almost obovate, of a thin and flaccid texture, with an extremely short
stipes.
Tin be IV. Sporochxoide E.
Plants all marine, of an olivaceous or yellowish -green colour,
not changing to black in drying ; of a curtilayineo-membranaceous
substance, becoming flaccid almost immediately after exposure to
the air, in some cases acquiring, under suck circumstances, a rerdi-
gris-green colour, and then possessing the property of rapidly decomposing
other delicate Algcc in contact with them. Frond with
a scutate (rarely tomentose) root, flat, compressed or cylindrical,
with distichous (rarely irregular) branches, and bearing in most
species, at some period of their growth, little pencil-like deciduous
tufts offne green filaments. Fructification, sofar as it is known,
composed of club-shaped, moniliform, radiating filaments, either
forming sessile warts, or arranged concentrically in little, stalked,
club-shaped bodies, terminated by pencils of delicate fibres. Grev.
9. Desmarestia. Lamour. Desmarestia.
Frond cartilaginous, plane or compressed, distichously
branched, while young furnished with marginal deciduous tufts
of fine green filaments, the branches set with marginal spines.
Grev. Alg. Frit. p. 36. t. 5 Named in compliment to A, G.
Desmarest, a celebrated French naturalist.—The fructification
is unknown.
1. D. ligidata, Lamour. (ligulatc. Desmarestia) ; frond elongated
plane with an obscure midrib 3—4 times pinnate, the pinna
and pinnuhe opposite linear-Ianeeolate attenuated at the base
Grev. Alg. Brit. p. 37. /. 5,
p. 158.
—
—
Sporochnus ligul., . \g. Sp. Alg, r. ].
Desmia UguL, Lyngb.— Fucus Haul., Lightf. Sect.
p. 946. /. 29. Turn, Syn. Fuc.p. 99, Hist. 'Fur. t. 96. B. Boi,
t. 163(1.
Principally on the southern and south-western shores of England.
Firth of Forth and Orkney, AVr. c. Clouston, Miltown Malbay,
Inland, Mr. Harvey, ©. Summer.—Two to 5 or (i feet in length;
colour a pale olive-green. Dr. Greville mentions Mr. Tamer's var,
dilatata, with the frond nearly 4 lines broad, as being (bond in Orkney
i>\ Mr, Clous/ on.
•J. D. nritlrdtii. Lamour. (aculeated Desmarestia) ; Btem short
rounded bearing numerous filiform flattened branches which are
again divided in ;i pinnated manner, the pinnules with distichous
spines. -Grev. Alg. Britp. 38. t. 5,f, 2, 3, s y rochnus
aculeatus, Ag, Sp, Alg, v, I. p, I.»l.— Desmia aculeata x Lyngb,—
Fucus (iiiilifitus. I. inn. Turn, Syn, Fur. p. 262, Hist, Fuc.
t. 187. /;. lint. t. 2445.