344 ALGiE CONFERVOlDEiE. [Calithamnion. 



branches erect flexuose level-topped, plumules elongate 

 erect linear-obovate truncate, pinnae long and flexuose, the 

 lowermost simple appressed, the upper erecto-patent ramulose 

 at the top, articulations of branches thrice, of pinnae once or 

 twice, as long as broad subtorulose. 



Sea-shores, at Yarmouth, Mr. Borrer. — 2 — 3 inches high, nearly naked 

 at the base, much branched and tufted upwards, bushy, very slender; 

 the apices of the branches looking, to the naked eye, as if truncated, or 

 corymbose; branches long and flexuose, very erect, their upper half closely 

 plumulate, plumules long appressed. Colour a fine purple-red. Articu- 

 lations of the main-stem nearly opaque, composed of jointed fibres. Cap- 

 sules rave, subsolitary, elliptical, at the base of the pinnae. 



18. C. Borreri, Ag. (Borrer s Calithamnion); filaments 

 slender membranaceous loosely branched, plumules fanshaped 

 naked below, pinnate above, pinnae recurvo-patent simple, the 

 lower ones the longest, articulations of the branches 4 — 5 times, 

 of pinnae twice or thrice, as long as broad, joints contracted. — 

 Ag. Sp. Alg. v. 2. p. 170. — Co?iferva Borreri, E. Bot. t 1741. 

 Dillio. Conf. Syn.p. 79. 



Yarmouth, M r. Borrer. 2 inches high, forming slender tufts, of a de- 

 licate pink colour, turning to orange in fresh-water. Substance flaccid 

 and delicately membranaceous. A very rare and little known plant. Our 

 description is drawn up from an original specimen, communicated by 

 Dawson Turner, Esq. 



19. C. seminudum, Ag. (semi-denudated Calithamnion); fila- 

 ments much branched somewhat rigid, plumules fanshaped 

 naked below, pinnate above, pinnae long patent simple, the lower 

 ones the longest, articulations of branches zig-zag 2 — 3 times 

 as long, of pinnae about as long as broad. — Ag. Sp. Alg. v. 2. 

 p. 167, (according to specimens from the author}) 



Pier, Torquay, Mrs. Griffiths. — 1 — 3 inches high, sparingly branched 

 below, excessively branched in the upper part, branches flexuose, their 

 upper half alternately plumulate; pinna? simple or ..with the upper half 

 once again pinnated. Colour a fine dark-red, given out in fresh-water. 

 Articulations of the stem swollen at the joints. Capsules very rare, 

 minute, sphserical, seated at the base of the older pinnae. In drying, it 

 adheres pretty strongly to paper. Nearly allied to C. Borreri; but dis- 

 tinguished by the above characters. 



20. C. affine, Harv. MSS. (allied Calithamnion); much 

 branched, secondary branches of a roundish outline long alter- 

 nately plumulate, plumules very narrow linear-clavate simply 

 pinnate, pinnae short erect increasing in length upwards attenu- 

 ate crowded at top, articulations of branches 3 — 4 times, of 

 pinnae once and a half, as long as broad. 



Shores of Bute, on Fuci; Dr. Greville. —Excessively branched, 2 — 3 



inches high, bushy, main filaments much divided, set with very numerous 



alternate secondary branches, of a roundish or ovate figure, alternately 



plumulate ; plumules short, very narrow; lowermost pinnules distant, 



'•ort and somewhat spine-like, uppermost elongated and crowded. 



"Mir deep-red. Articulations of the stem 4 times as long as broad, 



