332 ALG.E CONFER VOI DE/E. [Polysiphonia- 



On marine rocks, near low-water mark, not uncommon. — Closely alli- 

 ed to P. atro-rubescens, of which I more than suspect it to be a variety 

 or merely the young state. Fruit unknown. 



14. P. denuddta, Grev. (naked Polysiphonid); filaments long 

 rigid sparingly branched, branches distant naked with very pa- 

 tent axillae, articulations uniform once and a half as long as broad. 

 — Conferva denudata, Dillw. Syn. Conf. p. 85.*. G — Hutchin- 

 sia denudata, Ay. Sp. Alg. v. 2. p. 73. 



At Southampton, Miss Biddulph.— This, I have no doubt, is only a 

 battered state of the last. The filaments are 4—6 inches long, with a 

 few straggling branches. 



15. F.violdcea, Grev. (purple Poly siphonia); filaments flaccid 

 much and fasciculately branched upwards, branches subdichoto- 

 mous patent, ramuli scattered elongate subsimple, middle arti- 

 culations 3—4 times upper twice as long as broad, capsules 

 shortly pedicellate subovate. — Hutchinsia violacea, Ay. Sp. Alg. 

 v. 2. p. 76.—Lyngb. Hydroph. Dan. t. 356. (excl.fig. a.) 



On marine rocks, &c, probably common. Appin, Capt. Carmiehael. 

 Elberry Cove, Devon, Mrs. Griffiths.— 3—4 inches high, sparingly 

 branched at the base, much and somewhat fasciculately branched upwards, 

 branches long, patent, subdichotomous, the secondary ones very erect, 

 almost appres-ed, with roundish axillae, ramuli elongated, virgate, straight, 

 simple, or with a few ramular processes near the apex, often fibrillose. 

 Articulations 5— 7-striate, the basal ones very shortcut rapidly elongating. 

 Colour a dull red ; substance flaccid and adhering to paper. Capsules 

 shortly pedicellate, ovate or suburceolate, with an elongated but not 

 contracted neck, scattered over the ramuli. 



] 6. P. nigrescens, Grev. (dark Polysiphonid) ; filaments robust 

 rigid below, much branched and bushy, ramuli crowded erect 

 alternate subulate the uppermost fasciculate, lower articulations 

 very short, upper rather longer than broad, capsules ovate sessile. 

 Conferva fucoides, Dillw. Conf. t. 75. E. Bot. t. 1743.— C. nigres- 

 cens, Dillw. Syn. Conf. p. 81, and E. Bot. t. 1717 — Hutchinsia 

 nigrescens, Ag. Sp. Alg. v. 2. p. 69. 



On marine rocks, &c, common. A variable species ; but easily dis- 

 tinguished by its bushy habit and luoody stems, rough with broken 

 branches. The only difference I can find between the Conf. fucoides 

 and nigrescens of authors, lies in the habit; the one having more erect 

 branches than the other ; but this surely is of no importance in such 

 variable plants. 



17. P.furcelldta (forked Polysiphonid) ; filaments elongated 

 tufted entangled flexuose repeatedly and closely dichotomous, 

 axils broad rounded, ramuli erect, apices forcipate, middle 

 articulations 3—5 times longer than broad. — Hutchinsia furcel- 

 lata, Ag. Sp. Alg. v. 2. p. 91. 



Floating in the sea, at Sidmouth, Mrs. Griffiths and Miss Cutler.— 

 Filaments slender, 5— G inches long, much entangled, and excessively 

 branched, flexuose, the divisions dichotomous, very close toward the 

 extremities. Articulations polystriate ; striae slender, sometimes cross- 



