346 ALG^ CONFERVGIDE^. [Calithamnion. 



nately branched, branches with an axillary tuft, plumules 

 narrow-elliptical or lanceolate bipinnate, articulations of branches 

 flexuose with swollen joints, twice as long as broad, those of 

 the pinnae shorter. — Ag. Sp. Alg.v. 2. p. 168. 



Plymouth, Mr. Sconce. Pier, Torquay, Mrs. Griffiths. — 1—2 inches 

 high ; stem and branches flexuose, pinnae and pinnulae very slender, the 

 larger plumules with an axillary tuft like the branches, articulations of 

 the stem remarkably torulose at the joints, Colour rose-red. — Very 

 closely allied to C. thuyoides, but differing in its shorter articulations, 

 torulose joints, and the axillary tufts of the branches. 



25. C. thuyoides, Ag. (Arbor-vitce Calithamnion) ; very 

 slender irregularly branched, plumules linear-lanceolate bipin- 

 nate, articulations of the branches 4 — 6, of the pinnae 2—3 times 

 longer than broad, capsules terminal. — Ag. Sp. Alg. v. 2. p. 172. 

 — Conferva thuyoides, E. Bot. t. 2205. 



Very rare : Yarmouth, Mr. Borrer. Plymouth, Mr. Sconce.— Very 

 flaccid and slender, 1—3 inches high : plumules distant, alternate, 2—3 

 lines long ; ramuli extremely slender. Colour a fine rose-red. 



b. Secondary or smaller branches alternately dichotomous. Cap- 

 sules elliptical, solitary, axillary; favellce mostly binate. 



26. C. corymbosum, Ag. (corymbose Calithamnion); capillary 

 flaccid and gelatinous, secondary branches alternate excessively 

 dichotomous level-topped, ultimate ones dichotomous acute ap- 

 pressed, articulations of branches 8 — 10, of the ramuli 5— 6 times 

 longer than broad.— Ag. Sp. Alg. v. 2. p. 165 — Conferva co- 

 rymbosa, E. Bot. t. 235'i, (Joints too short.) 



Rare; at Brighton, Mr. Borrer. Bantry, Miss Hutchins. Appin, 

 Capt. Carmichael. Bute, Dr. Greville.— l—3 inches high, excessively 

 delicate and tender, much branched, secondary branches byssoid. Colour 

 a delicate rose-red. Capsules minute, elliptic-oblong, shortly pedicellate, 

 solitary, very rarely binate, trisporous, axillary. Favella large, binate. — 

 The figure in E. Bot. is not good, as it represents the joints too short. 

 Our description is taken from Mr. Borrer's original specimens. 



27. C. versicolor, Ag. (changeable Calithamnion); filaments 

 setaceous at base, capillary above, flaccid and tender, penulti- 

 mate branches alternate naked below, excessively dichotomous 

 above, level-topped, ultimate dichotomies spreading, articula- 

 tions of branches 4 — 6, of ramuli 2 — 3 times longer than broad. 

 Ag. Sp.Alg.v.2.p.l70 (according to specimens from the author). 



Coast of Devonshire, Mrs. Griffiths.— -2— 3 inches high, nearly as 

 thick ashog'sbristle at the base, excessively branched and capillary above; 

 branches set with alternate, erecto-patent, obovate, secondary branches, 

 generally naked below, their upper half furnished with dichotomo-multifid 

 alternate ramuli. Colour a beautiful rose-red. Capsules elliptical, sub- 

 sessile, solitary on the ramuli, in the axils of the dichotomies or at one 

 side. Favellce large, binate. Nearly allied to C. corymbosum, but a 

 larger and much coarser plant ; the joints shorter and the ultimate 

 dichotomies closer and more patent. 



28. C. spongiosum, Harv. (spongy Calithamnion); stems 



