P l a t e CXXII.
CYSTOSEIRA FOENICULACEA, Grev.
G e n . C h a r . Frond m u ch b ran ch ed , occasionally leafy a t th e b ase ;
becoming more slender u pwards, an d co n ta in in g s trin g s of simple
air-vessels w ith in th e ir su bstance. Receptacles te rm in a l, small, c ellular,
pierced by n um e rous pores, which communicate w ith immersed,
spherical conceptaeles, co n ta in in g p a rie ta l spores, a n d tu fte d antheridia.
O y s to sb ib a {Ag.),— from Kvo~ns, a bladder a n d <reipà, a cliain ; because
th e air-vessels are o ften a rra n g e d in s trin g s.
C y s to s b ie a foeniculacea ; stem, compressed ; branches long, slender, rough
with hard points, repeatedly dichotomo-pinnate ; air-vessels small,
solitary or two together, elliptical oblong, placed near the tips of the
branches ; receptacles minute, smooth, linear-lanceolate.
Cystoseiea foeniculacea, Grev. Alg. Brit. p. 6. Hook. Br. Ft. vol. ii. p. 365.
Wyatt, Alg. Banm. no. 51. Harv. Man. p. 18.
Cystoseiea discors, Ag. Sp. Alg. vol. i. p. 63, Ag. Syst. p. 384. Spreng.
Syst. Feg. vol. iv. p. 317. J . Ag. Alg. Meiit. p. 51. Fndl. Srd Suppl.
p. 30. MenegJi. Alg. Ital. and Balm. vol. i. p. 83. Mont. FI. Alger, p. 17.
Katz. PJiyc. Gen. p. 358.
Cystoseiea abrotanifolia, Ag. Sp. Alg. vol. i. p. 63. Ag. Syst. p . 384,
Spreng. Syst. Feg. vol. iv. p. 317. J. Ag. Alg. Medit. p. 53. Fkdl. Md
Suppl. p. 80. Menegh. Alg. Ital. and Balm. vol. i. p. 93. Mont. FI. Alger.
p. 19. Xiltz. Fhyc. Gen. p. 357.
Füous foeniculaceus, lAnn. Sp. FI. p. 1639. Turn. Hist. p. 353.
Fucus discors, Linn. Syst. Nat. p. 717. Turn. Syn. p. 70. Fsper, Ic. t. 36.
Stack. Ner. Brit. t. 17. E. Bot. t. 3131. lamour. Ess. p. 17.
Fucus abrotanifohus, lin n . Sp. FI. p. 1639. Htids. Ft. Arujl. p. 575. Stack.
Ner. Brit. p. 86. t. 14. Turn. Syn. p. 66. E .B o t. t. 3130. Lamour.
Ess. p. 18.
H a s . Growing on rocks, in tide pools, near low-water mark. Perennial.
Summer. Southern shores of England, in several places. Sussex, Iltid-
son. Sidmouth and Torquay, Mrs. GiiffitAs. Weymouth and Isle of
Wight, StacMouse. Jersey, M iss White and Miss Turner.
Geoge. D is t e . Atlantic shores of England, from the south of England to
Spain. Mediten-anean Sea.
Desoe. Boot a thick, hard, conical disc. Eronds one to two feet long, much
branched. Stem four to six inches long, as thick as a goose qnül, rough in
the upper part, with spine-like prominences. Branches numerous, lateral,
alternate, one to two feet long, filiform, rough with spinous processes,
especially below ; the older ones naked at base, pinnated above, with an
ovate outline. Finna twice or thrice divided in a mixed alternate and
dichotomous manner, slender, containing smaU, elliptical air-vessels below
their forkings. The branches of young plants, and occasionally of the
A i’ !1. le l.e tlifh iTirg