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Falklands, etc. | CRYPTOGAMIA ANTARCTICA. 195 
efformata, primum continua, matura terebrata v. clathrata (cellulis in lineis anastomosantibus dispositis) demum 
in massam gelatinosam subgranulosam collabens. Spore (seu granule) plerumque bine, anguste lineari-oblonge. 
—Genus Palmelle affine, sed indole frondis diversissimum. 
1. TRYPOTHALLUS anastomosans ; Hook. fil. et Harv.; Palmella ? anastomosans, nobis in Lond. Journ. 
Bot. vol. iv. p.298. (Tas. CXCIV. Fig. I.) 
Has. Christmas Harbour, Kerguelen’s Land; in clefts of rocks, and in damp caves, near the sea. 
Frons 1-1 unc. longa, undulato-crispata, pallide viridis, prima facie Ulvam furfuraceam referens, e strato 
unico cellularum formata, translucida; junior continua, suberecta v. horizontaliter extensa, margine lobata ; matura 
(e cellulis in lineas dispositis) pulcherrime clathrata, foraminibus diametro variis pertusa. Cellule hyaline, margi- 
nibus sub lente vix distinctis, dense aggregate, rotundatee v. obtuse angulate. Spore axi cellularum immerse, 
plerumque binze, leete virides (sub lente), post marcescentiam frondis diametro auctze, 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 clathrate 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. 
Prare OXCIV. Fig. 1.—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, 4y. 
1. Prorococcus stercorarius, Berk.; strato aurantiaco demum subrimoso, globulis demum margine 
pellucidis nucleis subgranulatis conformibus. 
Haz. Falkland Islands; on cow-dung; abundant. 
P. nivali, Desm., (quee eadem est ae P. pluvialis, Flotow) affinis, sed globulis minoribus saturatius coloratis, 
Hematococco 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. For 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, Vauch. 
1. Nosroc commune, Vauch. Conferv. p. 223. t. 16. £.1. 
Haz. 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 Alge 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, Corm.? ; Harv. Man. Brit. Alg. p. 184. 
Has. 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. microscopicum to be a variety of 2۷۰ muscorum, Ag. 
9x 
