342 ALGM CONFERVOIDE^E. [Calithamnion. 



opaque, filled with jointed veins. Capsules elliptical, rather large, secund, 

 2 — 4 on the pinnae toward the base. Favellce ovate, large, dark-red, binate 

 or clustered. Articulations in the stem and branches 4 — 5 times, in the 

 branchlets 3 — 4, and in the pinnules 2 — 3 times, longer than broad. — 

 Much confusion has been created respecting this species, by the discre- 

 pancies between the figures in English Botany and Dillwyrfs Conferva, 

 though both plates are stated to have been taken from specimens, from 

 the same locality, and each compared with the original plant of Roth. 

 The E. Bot. figure is much the best of the two, though neither pre- 

 cisely agrees with our plants or with any other species that L am ac- 

 quainted with. Agardh asserts, but 1 do not see with what reason, that 

 the plant described in the II. vol. Roth Cat. Bot. (which was that sent 

 to Mr. Turner and compared by him with the Yarmouth specimens), 

 differs from the species published by Roth, under the same name, in his 

 III. vol.; which latter, Agardh holds to be the true Ceramium roseum. 



11. C. byssoides, Arn. MS. (byssoid Calitliamniori); filaments 

 slender flaccid entangled, plumules flexuose and byssoid linear- 

 lanceolate, lower pinnae subsimple or bi-trifid, upper subcorym- 

 bose alternately multifid very erect, articulations of the branches 

 8, of the pinnae 4 — 5 times longer than broad, capsules sessile 

 solitary on the pinnae (not in the axils). 



Whitsand bay, G. A. W. Arnott, Esq. Devonshire, Mrs. Griffiths. — 

 2 — 3 inches long, much branched, entangled, and very slender, axils 

 acute, plumules crowded in the upper part. [Colour a fine rosy purple. 

 Capsules elliptical, sessile or minutely pedicellate, solitary on the ulti- 

 mate pinnules near the base. Habit very much that of C. corymbosum, 

 but differing in the alternate, not dichotomous, branching of the plumules 

 and the position of the capsules. 



12. C. polyspermism, Ag. (many -fruited Calithamnion); slender 

 membranaceous loosely branched, plumules lax linear-oblong, 

 pinnae short patent acute spine-like, articulations of the branches 

 4 — 5 times, of the pinnae twice, as long as broad, capsules lining 

 the inner faces of the pinnae. — Ay. Sp. Alg. v.2.p. 169. — Ceram- 

 ium Felixii, Gaillon ? 



Pier, Torquay, Mrs. Griffiths. Appin, Captain Carmichael. Mount 

 Edgecombe, Mr. Arnott. — 1 — 3 inches high, somewhat naked or with 

 short branches at the base, much and somewhat flabellately branched 

 upwards ; upper branches elongate, their lower half set with short spine- 

 like ramuli, above alternately plumulate, plumules pinnate, pinnae 

 nearly of equal length throughout, simple, the upper ones in old speci- 

 mens occasionally furnished with a new series of pinnae. Colour dull 

 rose-red. Articulations of the stem and main branches swollen at the 

 joints, with a very narrow tube. Capsules profuse, sphaerical. Favellce 

 large, roundish or ovate, binate. In drying, it scarcely adheres to paper. 

 A very distinct and beautiful species, well marked by its narrow plumules 

 and equal spine-like pinnae. 



13. C. tetricum, Ag. (rope-like Calithamnion); rigid, branches 

 densely ramulose hairy below, plumulate above, plumules 

 crowded quadrifarious oval simply pinnate, pinnae acute basally 

 attenuated erecto-patent, articulations 2 — 3 times longer than 



