Cystoseira.} ALGA: INARTICULATE. 265 



2. Cystoseira. Ay. Cystoseira. 



Frond furnished with branch-like leaves, becoming more fili- 

 form upwards. Air-vessels simple, arranged consecutively within 

 the substance of the branch-like leaves. Receptacles cylindrical, 

 more or less lanceolate, tuberculated, terminal. Grev. Alg. 



Brit. p. 3. /. 2 Name, kvctti?, a bladder, and ruga, a chain, from 



the chain-like little bladders. 



1. C. ericoides, Ag. (heath-like Cystoseira); frond cylindrical 

 branched closely beset every where with very short subulate 

 spinous leaves or branchlets, vesicles elliptical solitary, recep- 

 tacles swelling at the base of the terminal spines. Grev. — Ay. 

 Sp. Aly. v. 1 . p. 52. Grev. Aly. Brit. p. \. — Fucus ericoides, 

 Linn.— Turn. Hist. Flic. t. 191. E. Bot. t. 19G8 — F. ta- 

 mariscifolius, Huds. — F. sclayinoides, Linn. — Turn. Syn. Fuc. 

 p. 85. 



Rocks, especially on the S. West coast of England, where Mrs. Griffiths 

 finds it abundantly. Bantry Bay, M'us Hutching. Summer and 

 Autumn. £ . 



2. C. yranuldta, Ag. (granulated Cystoseira) ; frond cylin- 

 drical, stem bearing elliptical knobs each producing a filiform 

 repeatedly dichotomo-pinnate branch furnished with remote 

 subulate spines, air-vessels elliptical-lanceolate two or three 

 connected together, receptacles elongated. Grev, — Ay. Sp, 

 Ah j. v. 1. p. bo. Grev. Aly. Brit. p. 5. t. 2. — Fucus yranulatus, 

 Linn.— Turn. Hist. Fuc. t. 251. E. Bot. t. •2\(W.—F. mucro- 

 natus s Turn, Syn. Fuc p. 73. — F. famiculaceus, Good, ct 



Woodw. in Linn. Trans, v. 3. p. 134. 



Rocky pools left by the receding of the tide, particularly in Devon 

 and Cornwall, Mrs. Griffiths, Mr. RasMeigh, Mr. Turner^ $c. Bantry 

 Bey, Miss Huichins, Summer. 11. — Distinguishable from all other 

 British species bj the numerous elliptical knobs on the Btem, except 

 from the following, from which it is known In the absence oi' the ter- 

 minal spine of the receptacles. 



:{. ('. barbdta, Ag. (bearded Cvstoseira) } frond cylindrical, 

 ■torn furnished with elliptical knobs each producing ■ branch 

 many times dichotomo-pinnate and filiform, air-vessels lanceo- 

 late chain-like, receptacles ovato-elliptical niucronate. (iirr. — 



Ag, Sp, Alg, v. Up, 57. Grev, Alg, Brit, />. 6. — F, barbcUut, 

 Good, it Woodw, in Linn, Trans, v, 3, p. 128. Turn, Hist, 

 Fur. t. 250. 27. Bi i. t. 2170. — F, granulatuty GoodLet Woodw, 

 m l.'mn. Trans, v, 3. p, 131. (excL the syn.) 

 Said to h ive bees gathered bj Hudson on the Devonshire coast* 



1. C. fiemcuidceOi Ag. ( fenn e l leaved Cystoseira); frond 

 compressed, item destitute of tuberous knobs, branches more 

 or less rough frith little hard points repeatedlj pinnate filiform, 

 ■ir-vessels solitary or about tw<» together, receptacles linear- 

 lanceolate mostly proceeding from the terminal resides. Grev 



