*27(j ALGJE INARTICULATE. [Asperococcus. 



scutate or composed of a mass of woolly fila merits. Frond cylin- 

 drical or flat ; when fiat, nerveless (except in Haliseris), thin, entire 

 or divided, often fiabelliform. Fructification ; roundish-ovate, 

 pear-shaped or club-shaped seeds, enveloped in a pellucid case, 

 covering the surface, or scattered, or forming minute spots or trans- 

 verse lines. The seeds in most cases are produced beneath the epi- 

 dermis, through which they burst, and become prominent. Grev. 



13. Chorda. Stackh. Sea Whip-lash. 



Frond simple, filiform, cylindrical, with an interrupted ca- 

 vity. Root naked, scutate. Fructification ; external continuous 

 masses of pear-shaped seeds, fixed by their base. Grev.Alg. 

 Brit. p. 46. t. 7. — Name, chorda, a cord. 



1. C. Filum, Lamour. (common Sea Whip-lash); frond carti- 

 laginous slimy cylindrical filiform attenuated at both extremi- 

 ties internally jointed externally not regularly constricted, spi- 

 rally twisted when old. — Lamour. — Hooh. in Fl. Lond. N. S. 

 cum Ic. Grev. Alg. Brit. p. 47. t. 7 — Scytosiphon Filum, Ag. 

 Sp. Alg. v. 1. p. 161. — Fucus Filum, Linn. — Turn. Syn. Fuc. 

 ^.339, Hist. Fuc. t. 96. E. BoL t. 2487 — (3. Thrix ; frond 

 very slender almost capillary, 2—4 inches in length. Grev — 

 Fucus Thrix, Stachh. Ner. Brit. t. 12. 



Abundant on the rocky shores of Great Britain, often in deep water. 

 ©. Summer and Aut — From 1—20 feet long, " composed of a simple 

 fillet, one or two lines in breadth, spirally twisted into a filiform tube, 

 formed by the cohesion of its edges," (Carm.,) olive-brown, covered with 

 slimy, minute, conferva-like hairs. Fructification covering the surface 

 of old fronds with the pyiiform seeds. Capt Carmichael has likewise 

 found another kind of fructification, represented in the Flora Londin- 

 ensis and consisting of sessile, ovate capsules, scattered among clavate 

 articulated filaments. 



2. C. lomentdria, Grev. (jointed Sea Whip-lash); frond mem- 

 branaceous, the transverse septa remote and at irregular inter- 

 vals accompanied with external constrictions, the interval some- 

 what inflated— Lyngb. Hydroph. Dan. p. 74. t. 18. Grev. Alg. 

 Brit. p. 48. — Scytosiphon Filum, var. y. Ag. Sp. Alg. v. 1. 

 p. 162. 



Rocks and stones in the sea; frequent in Devonshire, Mrs. Griffiths. 

 Near Belfast, Dr. Drummond. Miltown Malbay, Mr. Harvey. 

 Abundant both on the western and eastern coasts of Scotland, Dr. 

 Greville. ©. Summer and Aut.— 3— 16 inches long; spurious dissepi- 

 ments, occasioning the apparent internal articulation, are at very une- 

 qual and generally considerable distances from each other, externally 

 constricted in those places. Dr. Greville describes the fructification as 

 interrupted masses of cylindrical or somewhat clavate filaments, which 

 are in pairs ; each pair of filaments being connected by their bases. 



14. Asperococcus. Lamour. Asperococcus. 

 Frond (simple) tubular, cylindrical or compressed, continu- 



