194 NEMATOPHYCE.E. 



Ulrapisiformis, Huds. Fl. Aug. 572. With AIT., iv. 120. 

 Chcetophora elegans, Lyngb. Hydro, t. 65. 



On submerged plants. 



Plate LXXVII. fig. 1. Plants of Clicetopliora pisiformis, natural 

 size, and filaments X 400. 



Chaetophora tuberculosa. (Rotli.') Ag. Syst. 



Thallus subglobose, the size of a cherry, bright or pale green, 

 surface tuberculose, elastic, fascicles of branches very dense, 

 lower articulations cylindrical, the upper swollen, extremities 

 cuspidate, sharp pointed, rarely hair-like. 



SIZE. Cells 0.09- > 012nim., of branches -OOS-'Ol mm. 



Harv. Man. p. 122. Hciss. Alg. 126, t. 9, f. 7, 8. Kntz. 

 Tab. Phyc. iii., t. 10, f. 1. Rabh. Alg. Eur. iii., 383. Eng. 

 Fl. v., 389. Jenner Tunb. Wells p. 178. Eng. Bot. ii., t. 

 2547. Jolmst. Fl. Berw. ii., 260. Mack. Hib. 223. Hook. 

 Scot, ii., 76. Kirch. Alg. Schles. p. 69. 



Rivularia tuberculosa, Eng. Bot. i., 2366. 



In clear water. 



Plate LXXriII, fig. 1. #, plant of Ch<?toj)hora tuberculosa, natural 

 size, b, filaments of same X 400 diam. 



Chaetophora elegans. (Roth.) Ag. Syst. 



Thallus the size of a pea or a cherry, pale green, surface 

 even, elastic, soft, now and then becoming hard, fascicles of 

 branches lax, rather flaccid, extremities shortly cuspidate, often 

 terminating in a hair. 



SIZE. Cells -007--009 mm., of branches -005--007 mm. 



Kutz. Tab. Phyc. iii., t. 20, f. 1. Rabh. Alg. Eur. iii., 384. 

 Kirch. Alg. Schl. p. 69. Eng. Fl. v., 389. Jenner Tunb. 

 Wells 178. Mack. Hib. 223. Harv. Man. 122. Grev. Fl. 

 Ed. p. 321. Hass. Alg. 127, t. 9, f. 3, 4. 



Rivularia elegans, Eng. Bot. i., t. 1797. Purton Mid. Fl. 

 ii., 618. 



In clear water, attached to submerged plants. 



Paler in colour, and more hyaline and gelatinous than C. pisiformis. 

 Plate LXXVII. jig. 2. a, plants of Qlitttopliora, elegans natural 

 size, b, zoogonidia. c, filament X 400. 



Chaetophora endiveefolia. Ag. Syst. p. 28. 



Thallus' linear, flattened, -|-1 inch, now and then elongated, 

 bright or dark green, dichotoniously laciniate (sometimes with 

 the habit of Riccia fiuitans'), threads and primary branches 

 mostly colourless, here and there with green zones, parallel ; 



