356 ALGJE CONFERVOIDEiE. [Conferva. 



branched erect densely tufted somewhat rigid short green, 

 branches subsecund, articulations incrassated upwards about five 

 times as long as broad." — Dillw. Conf. Syn. t. D. Ag. Syst. 

 Alg. p. 105. 



" On wet rocks, in a cave near Dunrea, Ireland, R. Brown, Esq** 

 Dillw. 



31. C. nigricans, Roth, (blackish Conferva); " filaments dicho- 

 tomous somewhat rigid blackish-green, branches long remote 

 patent, articulations four times as long as broad." Dillw. Conf. 

 Syn. t. E. — C. aspera, Ag. Syst. Alg. p. 1 15? 



In a pond at Wimbledon, Surrey, Mr. Dickson. — A very obscure plant, 

 of which I know nothing. 



32. C. crispdta, Roth, (branching cross-jointed Conferva) ; 

 " green branched crisped and entangled, branches alternate 

 copious acute, joints even several times longer than broad 

 alternately contracted when dry." Sm. E. Bot. t. 2350. Dillw. 

 Conf. t. 93. Ag. Syst. Alg. p. 109. 



"Collected in pools in Sussex, by Mr. Borrer." Sm. — I am not able 

 to distinguish this from C.fracta, the chief differences appearing to lie 

 in the length of the joints ; but this surely is most variable. 



33. C. flavescens, Roth, (yellowish branched Conferva); form- 

 ing pale-yellowish strata, filaments slender sparingly branched, 

 branches alternate or subdichotomous erecto-patent with scat- 

 tered elongated alternate or secund ramuli, articulations 8 — 9 

 times longer than broad. — Dillw. Conf Syn. t. E. — Ag. Syst. Alg. 

 /?. 112. E. Bot. t. 2088.— C. pinnatxda , Fl. Dan. t. 945, (sec. 

 Both.) Dillw. Conf t. 95. 



In ditches of salt or fresh-water, not uncommon ; forming vast strata, 

 which finally rise to the surface.— Allied to C.fracta; but the filaments 

 are more slender, with longer joints and of a pale yellow colour. It 

 does not in the least adhere to paper. 



34. C. frdcta, Fl. Dan. (broken divaricated Conferva) ; form- 

 ing entangled dull-green strata, filaments somewhat rigid much 

 branched, branches divaricating, ramuli scattered and very 

 patent, articulations 4 — 6 times longer than broad. — Dillw. 

 Conf t. 14. E. Bot. t. 2338. Lyngb. Hydroph. Dan. t. 52. Ag. 



Syst. Alg. p. 109 C. vagabunda, Linn. — Huds. (3.flexuosa. 



—C.flexuosa, Dillw. Conf t. 10. E. Bot. 1944. 



In ditches, &c, common. — ,3. in salt-water ditches, near Yarmouth, 

 D. Turner, Esq. — Forming vast strata, finally rising to the surface. 

 Filaments much and very irregularly branched, all the branches very 

 patent. j3. differs in being less branched, remarkably flexuose, the 

 ramuli elongated and secund, and the joints somewhat shorter ; but 

 there are intermediate appearances, and Dillwyn himself confesses that 

 it is not always easy to distinguish between the two. 



35. C. glomerdta, Linn, (green clustered Conferva); root scu- 

 tate, filaments tufted bushy subrigid bright-green, branches 

 crowded irregular erect, ultimate ramuli secund subfasciculate, 

 articulations 4 — 8 times longer than broad. — Dillw. Conf t. 13. 



