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Fresh-water Species, 

 Lemania fluviatilis. 

 Batrachospermum moniliforme. 



cserulescens. 



Draparnaldia plumosa. 

 Chaetophora endivisefolia. 



tuberculosa. 



Conferva borabycina. 



zonata. 



rivularis. 



eapillaris. 



fracta. 



glomerata. 



Mougeotia genuflexa. 

 Tyndaridea pectinata. 

 Zygnema deciminum. 



Ulva calophylla. 

 Palmella protuberans. 



Grevillei. 



hyalina. 



rupestris. 



cruenta. 



Nostoe commune. 



muscorum. 



verrucosum. 



Chantransia Hermanni. 



chalybea. (5) 



Chroolepus aureus. 



odoratus. 



ebeneus. (6) 



Protonema orthotrichi. 



( 1 .) I have follovf ed the nomenclature of Professor Harvey in his 

 " Manual of the British Marine Algae." Lond. 1849. — At the same 

 time I cannot refrain from acknowledging my early obhgations, in the 

 study of this class, to Lightfoot's Flora Scotica, and to the Synopsis 

 of British Fuci by Dawson Turner. The latter is a work of great 

 merit. — For the Fresh-water species, and those which may be pro- 

 perly called the aerial, I have adopted the names of Mr. Hassall in 

 his History of the British Freshwater Algae. Lond. 1845. 



(2.) Of this common species we have three distinct enough varie- 

 ties : viz. a. without vesicles, often prohferous, the pods ovate. = 

 Fucus spiralis. Withering : /3. without vesicles, the frond narrow, the 

 pods linear-elliptic, elongated : y. with vesicles, the pods elliptical. — 

 The F. ceranoides is abundant on the sides of the Tweed, from the 



