Falkland*, etc.] FLORA ANTARCTICA. 499 



Hab. Berkeley Sound, Falkland Islands ; on moist rocks ; Cockburn Island, Graham's Land ; very 

 abundant. 



A highly interesting species, because it is one of the very few terrestrial plants that have been gathered on 

 the limits of vegetation both in the Northern and Southern Hemispheres. It was collected in Spitzbergen, (in SO . N.) 

 by the officers of Captain Parry's Expedition towards the North Pole, and is a native of many intervening latitudes. 

 We have carefully compared these specimens with Agardh's original ones of U. crispa, from Norway, and find them to 

 be identical. The Cockburn Island specimens are in fine fruit 



6. Ulva cristata, Hook, fil et Harv. ; pusilla, stratum continuum furfuraceum efficiens, rrondibus cris- 

 patis lacunosis latioribus quam longis supra medium in laciniis perpluritnis fissis, laciniis filiformibus fistu- 

 losis tortis pluries divisis processubus cornicidatis simplicibus ramosisque midique obsitis, substantia tener- 

 riina, sporis confertis irregulariter dispositis rarius quaternis. 



Hab. Kerguelen's Land ; in moist clefts of rocks overhanging Christinas Harbour, growing with Try- 

 pothallm anastomosans. 



Frondes siugulse 2-6 lin longas, latiores quam longse, sessiles, basi contractse, laete virescentes, fragiles, margi- 

 nibus crispatis, superficie lacinioso v. profunde rugoso ; laciniis perplurimis gracibbus compressis v. teretibus, fistu- 

 losis, processubus divaricatis undique ornatis. 



A species so closely resembling the U. crispa, that we at first sight confounded it with that plant : it is, however, 

 abundantly distinct, in the much smaller spores, and in the curious long and slender laciniae of the frond, which are 

 tubular in the specimens we have examined, and, as well as the margins of the sessile frond, are studded with short 

 simple or divided hom-hke processes, or abbreviated ramub. 



53. MASTODIA, Hoolc.fil. et Harv. 



Frons plana, niembranacea v. subcarnosa, viridis, late expansa, inordinate areolata. Fructificatio duplex : 

 1°. Sporidia granulseformia, in areobs indefinita (ut in Ulva) fronde immersa. 2° Conceptacula manimaeformia, fronde 

 immersa, apice mamilla instructa, materie grumosa repleta, sporasque ellipticas foventia. — Genus Ulva? proximum, et 

 nisi presentia conceptaculorum nnllo modo distinguendum. 



1. Mastodia tessellata, Hook. fil. et Harv. Ulva tessellata, nobis hi Loud. Journ. Bot. vol. iv. 

 p. 297. (Tab. CXCIV. Kg. II.) 



Var. a. fronde tenuissima, laciniis longioribus. 



Var. /3. fronde carnosa siccitate rigida, laciniis rotundatis. 



Hab. Kerguelen's Land; var. a. in streams of fresh-water. Var. /3. on stones occasionally exposed in 

 a fresh-water lake. 



Frons fobacea, 1-2 unc. lata, luride viridis, subpbcata, siccitate rigidiuscula, suberecta v. in var. /3. horizontaiiter 

 expansa, sub lente granulis rnajusculis opacis in areolas quadratas compositas dispositis puleherrime quasi tessel- 

 lata, demum in lacinias plurimas undidato-crispatas rotundatas fissa ; areobs quadratis, lineis hyalmis circum- 

 scriptis, gi'anulis magnis quaternis. Conceptacula exemplaribus omnibus nobis visis perplurima, ad angidos areola- 

 rum majorum sita, elevata, mammasformia, apice palbdiore, crassa et carnosa, intus cava, materie gnunosa sporisque 

 lineari-ellipticis vbidibus immixtis farcta. 



Erroneously described as a marine species in the London Journal of Botany. Even when destitute of fruit it is 

 specifically very distinct from any Ulva, especially in the great size of the granules, and their comparative remoteness 

 from one another. The curious hemispherical bodies are abundant in all the specimens, and resemble in some degree 



