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P l a t e CLXII.
ECTOCARPUS SILICÜLOSUS,* Lyngb.
G en . Ch a e . Eronil capillary, jointed, olive or brown, flaccid, single-tubed.
E m it either spherical, elliptical, or lanceolate utricles (or spores),
borne on the ramuli, or imbedded in their substance. E c t o c a e p u s
[Lyngb.),—from ektos, external, and safmos, f r u i t .
E c t o c a e p u s silk u lo su s ; tufts yellowish or jiale olive green, gelatinous,
soft; filaments very slender, excessively branched; ultimate branchlets
alternate or secund, attenuated; utricles stalked, subulate, attenuated
to a fine point.
E c t o c a e p u s siliculosus, Lyngb. Hyd. Ban. p. I S l . t. 43. J g .S y s t .p f fi e i .
Grev. M. Edin. p. 314. Ag. Sp. Alg. vol. ii. p. 37. Sarv . m Hoolc.Br.
El. vol. ii. p. 335. Harv. in Mack. El. Hih. part 3. p. 181. Harv.
Man. p. 40. Wyatt, Alg. Banm. no. 173. J- Ag. Alg. Medit. p. 36.
Endl. 3rd Suppl. 31. Kiitz. Bhyc. Gen. p. 388.
C e e a m iu m siliculosum, Ag. Syn. p. 65. Hook. El. Scot. part 3. p. 86.
Ce e a m iu m confervoides, Both, Cat. vol. i. p. 151. t. 8. f. 3. and vol. iii. p. 148.
C o n p e e v a siliculosa, Billw. Syn. no. 113. t. E. Sm. Eng. Bot. t. 3319.
0. longipes-, stalks of the utricles very long.
H ab Parasitical on various marine Alg®, between tide marks, and in
three to four fathom water. Annual. Spring to Autumn. Very
common. at Jersey, Miss White.
G e o g k . D i s t e . Atlantic shores of Europe and North America. Mediten-anean
Sea.
D e s o e . Eilaments from three to eighteen inches long, densely tufted and excessively
branched, very slender, the main branches more or less entangled
too-ether, in old specimens especially, into slender rope-like bundles, the
les”ser branches free, spreading on all sides, long, and set with feathery
branchlets furnished with lateral byssoid ramuh. Branches and ramuh
alternate, or subsecund, issuing at acute angles; the latter long, and
tapering to a point. Joints from once and a half to twice as long as broad,
pellucid Utricles broadly subulate, or somewhat lanceolate, closely transversely
striate, tapering to a fine point, and occasionally produced at the
apex into a hyaline filament. In our var. (i. (fig. 4, 5.) the utricles are
borne ou vei-y long stalks, but not otherwise difiterent. SM a n c e very soft,
somewhat gelatinous, soon decomposing, closely adhering to paper in
drying; sometimes more harsh and coarser. Colour vai-ying from olive
green to yellowish or brown.
This is one of the commonest species of Ectocarpus in the
■* Erroneously printed reticuloms, in the hst given at the end of our first
volume.