Falklands, etc.] 



FLOEA ANTARCTICA. 



501 



efformata, primum continua, matura terebrata v. clathrata (cellulis in lineis anastomosantibus dispositis) demum 

 in massam gelatinosam subgranulosam collabeus. Spores (seu granulae) plerumque binse, anguste lineari-oblongfe. 

 — Genus Palmella; affins, see! indole frondis diversissimum. 



1. Trypothallus anastomosans ; Hook.fil. et Harv.; Palmella? anastomosans, nobis in Lond. Jonrn. 

 Bot. vol. iv. p. 298. (Tab. CXCIV. Fig. I.) 



Hab. Christinas Harbour, Kerguelen's Land; in clefts of rocks, and in clamp caves, near the sea. 



From |— ■ i- unc. longa, undulato-crispata, pallide viridis, prima facie Ulvam furfuraceam referens, e strato 

 unico cellulamm formata, translucida ; junior continua, suberecta v. horizontaliter extensa, margiue lobata ; matura 

 (e cellulis in lineas dispositis) pulcherrime clathrata, foraminibus diametro variis pertusa. Cellules hyalines, margi- 

 nibiis sub lente vix distinctis, dense aggregatae, rotundatas v. obtuse angulatee. Spores axi cellularam immersa;, 

 plenunque binse, laete virides (sub lente), post marcescentiam frondis diametro auctse, cellulasque fere implentes. 



We referred this plant doubtfully to Palmella, in the London Journal of Botany ; and now, unhesitatingly, we place 

 it in a new genus, most distinct from any previously defined. Under the microscope it is a very beautiful object, 

 the full grown specimens appearing as a transparent frond, firmer and more membranous than Palmella, and much 

 thicker in proportion than any Ulva, beautifully clatbrate or formed of anastomosing branches : the branches are 

 composed generally of one, or more rarely, of two collateral lines of cells, each containing a pair of parallel minute 

 spores, of a bright green colour, placed at right angles to the axis of the branch. 



Plate CXCIV. Fig. I. — 1, plant in its foliaceous and reticulated condition ; 2, the same at a later stage, forming 

 a gelatinous mass ; 3, the same with the spores disunited ; — all of the natural size ; 4, portion of foliaceous state ; 

 5 and 6, portions with anastomosing structure ; 7 and 8, spores : — all very highly magnified. 



57. PROTOCOCCUS, Ag. 



1. Protococcus stercorarius, Berk.; strato aurantiaco demurn subrimoso, globulis demum margine 

 pellucidis nucleis subgranulatis conformibus. 



Hab. Falkland Islands ; on cow-dung ; abundant. 



P. nivali, Desm., (quse eadem est ac P. pluvialis, Flotow) affinis, sed globulis minoribus saturatius coloratis, 

 Hesmatococco Orsinii, Menegh., quoque referens. 



This curious vegetable appears abundantly in places frequented by cattle, covering their droppings with a pale 

 orange stratum in a very short space of time. Tor the identification and description of the species we are indebted 

 to our learned friend Mr. Berkeley, who had previously observed the same plant in England. 



58. NOSTOC, Vouch. 



1. Nostoc commune, Vauck. Conferv. p. 223. t. 16. f. 1. 



Hab. Christmas Harbour, Kerguelen's Land ; on wet rocks near the sea. 



The Rev. M. J. Berkeley has favoured us by examining this, the following, and several other of the lower forms 

 of Algee collected during the Antarctic Expedition : of the present he says that it scarcely differs from the N. com- 

 mune, of England, which is common throughout Europe, and in Bolivia and the Canary Islands. 



2. Nostoc microscopicum, Carm. ?; Harv. Man. Brit. Alg. p. 184. 

 Hab. Christmas Harbour, Kerguelen's Land ; on wet rocks near the sea. 



Specimens rather larger than those of British growth, but not otherwise different. Mr. Hassall considers the 

 N. ruicroscopicum to be a variety of N. muscorum, Ag. 



6 A 



