92 ACOTYLEDONS. — ALG.E. Vauchciia. 



branched subcomoressed. Light/, p. 969. E. B. t. 173!). 



DHL Muse. t. 9. '/. 8, A— G. 

 Hab. In the sea and in marine ditches ; sometimes in fresh-water. 

 Extremely variable in its length and breadth ; occasionally so narrow 



as to resemble a very long Confenni. May not this and the last 



species be mere vars. of each other ? 



9. V.Jistidosa, frond tubular filiform tapering at the base and 

 summit simple brown subgelatinous and here and there con- 

 tracted. E. B. i.642. Conferva Fistula, Roth. Cat. Bot. y.3. 

 p. 169. U. incrassata, Fl. Dan. Fucus Filum, /3. Ag. p.\4. 



Hab. Firth of Forth^ near Dysart, attached to rocks and shells^ Mr. 



GreviUe. 

 Four to 6 or S inches high, sometimes divided at the very base. 



10. U. ? defracta, frond filiform tortuose gelatinous white pellu- 

 cid with numerous red dots. E. B. t. 1626. 



Hab. Attached to Fiici, Sec, on the shores of the Orkney islands, Mr. 

 Borrer and Hook. 



Tliis has rather the appearance of animal matter, and is very unlike 

 any other Ulva. It is from 1 — 2 inches long, and 'about 1 or In- 

 line in diameter, adhering by its viscid quality to marine bodies. 



1 1. U. ? purpurasceiis, subgelatinous purplish filiform attenuated 

 branched, branches scattered long simple distant. E. B. 

 t. 641. Ulva filiformis, IVahl. Lapp. p. 508. 



Hab. In the sea near Granton, MaugJi. 

 Internally gelatinous, and scarcely of this genus. 



20. VAUCMERIA. Decand. {Ectospcrina Vauch.) 



Fruit : vesicles of the same texture and substance as the fila- 

 menls, which have within a scattered granulated mass. — 

 Fronds filiform, tubular, branched, continuous, rather rigid, 

 intricate, so as to be with difficulty umavelled, composed of a 

 subdiaphanous membrane or coat. Vesicles generally lateral, 

 'sometimes terminal, often pedunculated, about twice as broad 

 as the filament, solitary or clustered : these fall off, and, ac- 

 cording to Vaucher, vegetate. Between these vesicles are, not 

 unfreipient, in some species, sterile, hooked peduncles, which 

 some have called anthers. — The species live in fresh water or 

 upon moist earth. 



* Growing in water. 



1. V. ccvspitosa, filaments dichotomous csespitose, vesicles two 

 terminal with an intermediate horn-like process, ylg. p. 4S. 

 Conferva canalicularis, Light/, p. 978. 



Hab. Found frequently upon the planks in mill-dams, and in the ca- 

 vities of water-pipes, Lighff. 



Forming a densely interwoven tuft or mass, deep green, from 1 — 2 

 inches high. 



Z. V. ornitliocephulaj filaments loosely branched, vesicles gene- 



