322 ALGlE CONFERVOIDEiE. {Cladostephus, 



1. L. fluvidtilis, Ag. (River Lemania); filaments branched 

 olive-green torulose attenuated, intervals between the swellings 

 cylindrical much longer than they are broad. — Hook. Fl. Scot. 



P. II. p. 84. Ag. Sp. Alg. v. 2. p. 4 Nodularia fluviatilis, 



Lyngb. Hydroph. Dan. p. 99. t. 29.— Chantransia fluviat, De 

 Cand. — Polyspermia fluviat., Vouch.— Conferva Jluviat., Linn. 

 —Dillw. Conf. t. 29. E. Bot. t. 1763.— Dill, Muse. t. l.f. 47. 



Rocky beds of rivers, chiefly in mountainous countries. © . Spring 

 and Summer.— From 6 or 8 inches, occasionally to a foot in length, ac- 

 cording to Mr. Dillwyn, and frequently covering the rocky beds of sub- 

 alpine streams with a dark olive-coloured mass. 



2. L. torulosa, Ag. (beaded Lemania) ; filaments nearly simple 

 moniliform.— Ag. Act. Holm. 1814, t. 2. f ].— Conferva toru- 

 losa, Roth.—Dillw. Conf. Synops. p. 77. t. F. Dill. Muse. 

 t. l.f. 48.— C. fluviatilis, (3. torulosa, Both, Cat. v. 1. p. 200. 

 E. Bot. t. 1763. 



Mountain-streams, near Ludlow, Dillenius. Anglesea, Rev. H. Davits. 

 —I fear the more or less beaded appearance of the fronds will hardly 

 afford a permanently distinguishing character between this and the pre- 

 ceding. 



Div. II. CONFERVOIDE^E. 1 



Plants filamentous, really or apparently articulated (destitute of 

 definite gelatine). Gen. 56 — 84. 



Tribe XIV. Ectocarpe^:. 



Plants olivaceous or virescent, marine. Fructification monce- 

 cious; external capsules, and globules in swollen ramuli. 



56. Cladostephus. Ag. Cladostephus. 



Filaments cartilaginous, inarticulate, whorled with short arti- 

 culated ramuli, olivaceous. Fruit double ; — 1. ovate capsules fur- 

 nished with a terminal pore; 2. granules imbedded in the apices 

 of the ranadi. — Name, from zXa^og, a branch, and c-ntpog, a 

 crown; in allusion to the ichorled ramuli. — A small and natural 

 genus ; the Dasytrichia of some French writers. 



1. C. verticilldius, Lyngb. (ichorled Milfoil Cladostephus); 

 ramuli regularly whorled sub- distant mostly forked. — Lyngb. 

 Hydroph. Dan. p. 102. t. 30. Hook. Scot.—C. Myriophyllum, 

 Ag. Sp. Alg. v. 2. p. 10. — Conferva vertic, Dillw. Conf t.55. E. 

 Bot. t. 1718 and t. 2&l.f. 2. 



In the sea, on rocks and corallines, frequent.— Filaments 3— 9 inches 

 high. Capsules unknown. Mrs. Griffiths sends us individuals of this 

 and the following species, in which some of the apices are minutely 

 sphacelate and granuliferous. We find a similar appearance on Irish 

 specimens. 



2. C. spongiosis, Ag. (Sponge-like Cladostephus); ramuli ir- 



1 By W. H. Harvey, Esq. 



