478 FLORA ANTAECTICA. [Fnec/ia, the 



2. Geacilaeia (?) aggregate, Hook. fil. et Harv. ; casspitosa, nigrescens, frondibus fastigiatis e basi 

 communi late scutata carnosa ortis plurimis filiformibus, primariis cylindraceis cartilagiueis vage subdichotome 

 ramosis, axillis angustis, ramis erectis sirnplicibus furcatisve omnibus compresso-cylindraceis filiformibus 

 superne subfastigiatis apicibus obtusis, fructu ? Nobis in Lond. Journ. Bot. vol. iv. p. 261. 



Hab. Falkland Islands ; on rocks in Berkeley Sound, Br. Lyall. 



Frondes 3-4 una altae, vix \ lin. diametro, e basi scutata, i una lata?, dense fastigiatae, siccitate rigidae, madore 

 cartilagineae, irregidariter superne praecipue raniosae, basi cylindracese, interdum siniplices, nunc e basi regulariter 

 dichotome ramosae. Rami ornnes erecti, axillis angustis, sinubus obtusiusculis, ultimi paulo latiores. Color nigro- 

 purpurascens, siccitate ater ; — chartae non adhaeret. Habitu Polgidis rotundi. 



Of this, again, we have seen no fruit ; but the structure of the frond is exactly that of the genus Gracilaria, to 

 which we consequently refer it. 



23. POLYSIPHONIA, Grev. 



1 . Polysiphonia atro-rubescens, Grev. Harv. in Brit. Fl. vol. ii. p. 331. 



Hab. Berkeley Sound, Falkland Islands ; scarce. 



Only a few specimens of this species, and in an immature state, were procured : they very closely approach 

 British ones in structure, but are, perhaps, more branched ; though we can detect no specific differences between 

 them. They differ from the following species in substance and in wanting the fibrillous apices of the ramuli ; the latter, 

 however, is an unimportant character. 



The species ranges from the Mediterranean Sea to the coasts of Scotland. 



2. Polysiphonia fusco-rulens, Hook. fil. et Harv.; atro-rubescens, obscure articulata, rigidiuscula, 

 multistriata, frondibus irregulariter dichotomis, caule angulatim flexuoso gracili sensim attenuato, ramis 

 majoribus dichotomis, minoribus alternis strictis elongatis, ramulis paucis subulatis erecto-patentibus, axillis 

 primariis patentibus secundariis acutis, articulis e tubulis octo radiantibus coloratis formatis, ramorum dia- 

 metro duplo-triplo-quadruplove, ramidorum sesquilongioribus. (Tab. CLXXXII. Fig. I.) 



Hab. Falkland Islands ; Mrs. Capt. Sidivan. 



Caules primarii ramosissimi, fasciculati, 6-8-unciales, graciles, fuifonnes, basi uudi, superne sub-angulatim 

 flexuosi, ad angulos ramos 2 una longos emittentes, rigiduli. Rami ramulique erecto-patentes, laxe pbuies divisi, 

 fasciculati, ultimi longitudine varii, \— 2 lin. longi, elongati v. subulati, omnes rigidiusculi. Color atro-rubescens : — 

 charts laxe adhaeret. 



Very similar indeed to the P. atro-rubescens, but differing in the flexuose stem ; also allied to P. anisogona, 

 nob., but of a totally different texture and consistence. 



Plate CLXXXII. Fig. I. — 1, ramuli ; 2, apex of ditto ; 3, transverse section of ditto : — all magnified. 



3. Polysiphonia anisogona, Hook. fil. et Harv.; atro-rubescens, flaccida, madore fragillima, frondibus 

 csespitosis irregulariter ramosissimis equalibus setaceis articulatis vix attenuatis, ramis ranxulisque alternis 

 subdichotomisve erectis v. appressis, axillis angustissimis, articulis variis inferioribus diametro sextuplo, 

 superioribus duplo triplove longioribus, ultimis sesquilongioribus v. quadratis, omnibus striis sex notatis e 



tubulis duodecim tenuibus radiantibus endochromate repletis formatis, ceramidiis ? Nobis in Bond. 



Journ. Bot. vol. iv. p. 268. (Tab. CLXXXII. Fig. II.) 



Hab. Herniite Island, Cape Horn, and the Falkland Islands ; not common. 



