Conferva.] ALG.E CHLOROSPERMEiE. 227 



Sand-covered rocks in the sea. 3—12 inches long, as thick as hog's 

 bristle, yellow-green, harsh. 



e. Filaments rising from disciform tubercles, and forming peni- 

 cillate tufa olivaceous, parasitical. Inhabit the sea. 



20. C.fucicola, Velley. Large parasitic Conferva. Fila- 

 ments rising from a minute tubercle, penicillate, flaccid, mem- 

 branaceous ; articulations about twice as long as broad. Dillw. 

 t. 66. Harv. in Hook. Br. Fl. v. ii. p. 345. 



On Fuci, especially F. nodosus and vesiculosus, common. 



21. C. fiaccida, Dillw. Flaccid rusty Conferva. Tubercles 

 small ; filaments penicillate, flaccid and tender ; lower articula- 

 tions half as long as broad, upper of equal length and breadth. 

 Dillw. Conf. Sup. t. G. Harv. in Hook. Br. Fl. v. ii. p. 355. 



Parasitical on Cystoseira fibrosa. 



22. C. curta, Dillw. Small Parasitic Conferva. Filaments 

 minute, rising from a tubercle, rather rigid, subpenicillate ; ar- 

 ticulations about as long as broad. Dillw. t. 76. Harv. in 

 Hook. Br. Fl. v. ii. p. 355. 



On sundry Fuci. 



23. C. scutulata, Sin. Target Conferva. Olive-brown ; fila- 

 ments branched at the base, densely combined into a depressed 

 peltate mass, rooted in the centre ; joints as long as broad. Sm. 

 —Dillw. t. 76. Harv. in Hook. Br. Fl. v. ii. p. 355. 



On Himanthalia lorea ; on which it forms broad wart-like tubercles. 



B. Filaments branched. 

 a. Inhabit fresh water. (C. glomerata often grows in the sea.) 



24 C. fiavescens, Roth. Yellowish branched Conferva. 

 Forming pale yellowish 6trata ; filaments slender, sparingly 

 branched ; branches alternate or subdichotomous, erecto-patent, 

 with scattered, elongated, alternate or secund ramuli ; articula- 

 tions 8 — 9 times longer than broad. Dillw. Conf. Suppl. t. E. 

 — E. Bot. t. 2088. Harv. in Hook. Br. Fl. v. ii. p. 356. 



In ditches of salt or fresh water. 



25. C. fracta, Fl. Dan. Broken divaricated Conferva. 

 Forming entangled dull-green strata; filaments somewhat rigid, 

 much branched ; branches divaricating ; ramuli scattered and 

 very patent : articulations 4 — 6 times longer than broad. 

 Dillw. t. 14. E. Bot. t. 2338. Harv. in Hook, Br. Fl. v. ii. 

 p. 356. 



In ditches and lakes, common. This floats on the surface, in vast 

 matted, dull green strata. 



