Gigartina.) ALGiE INARTICULATE. 299 



simple granules, imbedded in the fronds of distinct plants. 

 Grev. Alg. Brit. p. \2\.t. 14 and p. 146. t. 16.— Name; from 

 yiyx^rov, a grape- stone, which the seeds somewhat resemble as seen 

 through the capsule.— At the suggestion of Mrs. Griffiths and 

 Mr. Harvey, and with the approbation of Dr. Greville, I 

 gladly unite Gracilaria of the latter with Gigartina. The for- 

 mer of these Botanists having discovered the second or granular 

 mode of fructification upon Gigartina acicularis, it may be pre- 

 sumed to exist, though as yet unnoticed, in other Gigartina ; 

 and in G. Griffithsice and G. plicata no regular fructification 

 has been detected. 



1. G. purpurdscens, Lamour. (purplish Gigartina); frond 

 cylindrical filiform much and irregularly branched, ramuli seta- 

 ceous scattered bearing spherical tubercles immersed in their 

 substance. — Gracilaria purpur., Grev. Alg. Brit. p. 122. — 

 Sp/iccrococcus purpur., Ag. Sp. Alg. v. I. p. 318 Fuc us pur- 

 pur., Htuls. — Turn. Syn. Fuc. p. 357, Hist. Fuc. t. 9. E. Bot. 

 t. 1243. — F. tuberculatus, Light/. 



_ On submarine rocks and Algae, frequent. 0. Summer. — Varying in 

 size, from 6 — 8 inches to more than a foot, and also in the branches 

 which sometimes terminate in a kind of tendrils, twisting round other 

 Algae. The frond is somewhat gelatinous so as generally to adhere to 

 paper when dry, the colour is somewhat pellucid purplish-red, often 

 greenish in decay : but the best character is to be found in the immersed 

 capsules, causing a swollen appearance all round the ramuli which pro- 

 duce them. 



2. G. confervoides, Lamour. (Conferva -like Gigartina); frond 

 cartilaginous cylindrical filiform irregularly branched, branches 

 elongated bearing numerous slender ramuli attenuated at each 

 end, capsules external roundish scattered. — Gracilaria conferv., 

 Grev. Alg. Brit. p. 123. — Splicerococcus conferv., Ag. Sp. Alg. 

 v. 1. p. 303. — Fucus confervoides, Linn. — Turn. Syn. Fuc. 

 p. 328, Hist. Fuc. t. %±.—E. Bot. t. 1668.— F. verrucosus, Huds. 

 — 8. procerrima ; branches very long generally simple and 

 almost naked. Turn. — F. longissimus, Stachh. — y. aJbida ; 

 frond compressed mostly diehotomous. ramuli subulate. Turn. 

 — F. aUndus, II ikU. — 5. genicidata ; frond distorted and bent 

 as if broken at the tubercles. Turn. 



Rocky sea-shores, not (infrequent, especially in the south. Rare in 

 Scotland. Firth of Tav, Rev, J. Macvicar, Appin, Captain Carniic/iael, 

 and at Miltown Malbay, Ireland, Mr. Harvey. — More cartilaginous 



than the preceding, and generally more Blender, and abundantly distin- 

 guished by the different mode of fructification. 



3. G. compr&sa, (compressed Gigartina); frond cartilagi- 

 nous brittle between cylindrical ami compressed diehotomous, 

 branches subdistichous spreading las gradually attenuated to a 

 subulate point, capsules hemispherical Gracilaria n»njw*lsii, 

 Gtev. \i</. Brit* />. I -jo — Spharococc u s c o mpress uS) Ag. tip, Ma. 



