76 ACOTYLEDONS. ALGJE. Chatophora. 



mce scattered within the frond, hard, thicker than the fila- 

 ments, and producing new individuals. Colour light green, 

 brown, or purplish. 



* Filiform. Filaments from the axis of the frond. 



I.C.? vermiculata, "cylindrical much branched brown, branches 

 scattered subdivided crooked, internal filaments compound and 

 divaricated their ultimate branches clustered beaded thicken- 

 ed upwards, fruit (gemmae ?) sessile at the base of the beaded 

 branches." E. B. t. 1818 ( Rivularia vermiculata) . 



HAB. On rocks in the sea j Berriedale in Caithness, and at Losie- 

 mouth, on the coast of Morayshire, Mr. Borrer and Hook . 



2. C. multifida, frond rounded filiform solid repeatedly dichoto- 

 mous, the branches elongated divaricated, filaments within the 

 substance dichotomous very much branched, branchlets fas- 

 tigiate straight torulose blackish purple. Rivularia multifida, 

 Roth, Cat. Bot. t. 3. p. 335. Ulva rulra, E. B. t. 1627 ? 

 Chcetophora rulra, Ag. p. 127. 



HAB. Coast of Moray, on rocks in the sea, Mr. Borrer and Hook. 

 Colour purple. Can this be the younger state of R. vermiculata? If 

 so, the present name should be retained. 



** Filaments arising from the base of the fronds. 



3. C. endiviczfolia, frond compressed much branched, branches 

 lobed obtuse, filaments parallel branched at the extremity in 

 a fastigiated manner. Ag. p. 129. Ulva incrassata, E. B. 

 I. 967. 



HAB. In pools of fresh water near Brodie-house, by Forres, Hook. 

 One inch long, very soft and gelatinous, pale green, attached to 

 sticks, mosses, &c., in the water. 



4. C. tuberculosa, frond globose hollow, granules numerous scat- 

 tered through the mass and emitting filaments. Ag. p. 129. 

 Rivularia tuberculosa, E. B. t. 2366. 



HAB. Ditches and lochs (fresh water), occasionally. In a ditch lead- 

 ing into Frankfield Loch ; and in a well near Clyde Iron-works, 

 Glasgow, Hopk. Rivulet near Edinb., Mr. Greville. 



From a quarter to half an inch in diameter, palish green, wrinkled, 

 but very soft. Filaments much branched, diaphanous at the points. 



Div. II. CONFERVOIDE^E. Fruit, either naked granules included 

 in the frond, or capsules. Frond tubular, internally or ex- 

 ternally jointed. Substance membranous. Root generally 

 none. Fronds either affixed by their base, or floating, free, 

 tubular, filiform or capillary, jointed ; joints sometimes annu 

 liform, sometimes external, sometimes internal (as in Oscilla- 

 toria and Scytonema), simple or branched. The articulations 

 various in length, full of a coloured matter, generally either 



