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192 CRYPTOGAMIA ANTARCTICA. [Puegia, the 
A plant so nearly related to the common L. muralis, of Britain, as to require no detailed description. 
Prate 0210111, Fig. IL.—1, plant of the natural size ; 2, thread, highly magnified ; 3, portion of ditto :—still 
more highly magnified. 3 
9. Lynesya subarticulata, Hook. fil. et Harv. ; filis tenuissimis laxe implexis vix tortis hic illic ob- 
scure subarticulatis, sporidiis disciformibus diametro variis filum vix 4 eequantibus ad articulos spurios fili 
solutis. 
Has. Christmas Harbour, Kerguelen's Land; creeping amongst Uwe &c., on wet rocks near the sea. 
Fila cylindracea, sub 375 unc. lata, pellucida, obscure articulata, articulis diametro ter longioribus, intus cum 
axi e sporidiorum disciformium composito aucti. Sporidia leete viridia, opaca, ter quaterve latiora quam longa. 
A very different species from either of the two former. Each filament is a transparent tube, very obscurely 
incrassated, as if jointed here and there, and containing an axis of sporidia about halfits own diameter. The sporidia 
are discoid, of various breadth and length, but always much broader than long, of a bright green colour, and inter- 
rupted opposite the spurious articulation of the filament. 
51. MICROCOLEUS, Desmaz. 
1. Mrcnocorsvs repens, Harvey; Manual, p. 168. Oscillatoria repens, Agardh Syst. p. 61. O. chthono- 
plastes 8, Harvey in Hook. Brit. Fl. vol. ii. p. 373. 
Has. Cockburn Island, Graham’s Land; (Lat. 64? S. Long. 57° W.) on the ground. 
Our specimens are very poor, as might be expected from the native place being on the limits of vegetation in 
that quarter of the globe which the plant inhabits. 
52. ULVA, L. 
1. Urva Lactuca, Linn; Grev. Scot. Crypt. Flor. V. 313. 
Has. Hermite Island, Cape Horn; sparingly. 
2. Urva latissima, Linn.; Engl. Bot. t. 1551. 
Has. Hermite Island, Cape Horn; Falkland Islands and Kerguelen’s Land ; very abundant. 
There is probably no shore between that of Iceland and Cape Horn, that does not produce abundantly this species 
of Alga. 
3. Urva rigida, Agardh, ۶ Syst. Alg. p. 189. 
Has. Port William, Falkland Islands ; common. 
Our specimens appear to be only a young dark-coloured variety of the former. The species is also a native of 
Brazil, and the west coast of South America. 
4. Urva Linza. Linn.; Harv. Phyc. Brit. t. XXXIX. 
Has. Falkland Islands and Hermite Island, Cape Horn; abundant. 
An abundant plant in the Atlantic and Mediterranean shores of Europe ; it has also been collected in New 
Zealand. 
5. Utva crispa, Lightf.; Harvey, Manual, p. 171. 
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